My Dune set is up in the custom set forum. Check it out. Here's a few cards to pique your interest. Warning: Potential Dune spoilers.
Lifetouch (Damage dealt to this creature also causes you to gain that much life.)
Deathlink (Damage dealt to this creature also causes that source's controller to lose that much life.)
General Miles Teg 2W
Legendary Creature — Rossak Bashar (M)
If a nontoken creature you control would die, if it’s enchanted, exile that creature and all Auras attached to it instead. Create a token that’s a copy of that creature, except it’s a white Spirit in addition to it’s other types, and it has no mana cost. Put the exiled Aura cards onto the battlefield under your control attached to the token.
3/3
Mohaim, Reverend Mother 1W
Legendary Creature — Rossak Witch (R)
Weirding (This creature can attack and block while tapped.)
T: Remove target attacking or blocking creature from combat.
0/3
Murbella of the New Sisterhood W
Legendary Creature — Rossak Witch (R)
Weirding
The first spell each player casts each turn costs 1 more to cast.
1/2
Shaihulud 4WW
Legendary Creature — Wurm God (M)
Weirding, lifetouch, deathlink
Shaihulud can block any number of creatures.
All creatures able to block Shaihulud do so.
If Shaihulud would leave the battlefield, shuffle it into it’s owner’s library instead.
6/6
Shaitan 3WW
Legendary Creature — Wurm God (M)
Shaitan enters the battlefield with five +1/+1 counters on it.
1G, Remove a +1/+1 counter from Shaitan: Create a 1/1 green Wurm creature token.
3B, Sacrifice a creature: Destroy target creature.
If Shaitan would leave the battlefield, shuffle it into it’s owner’s library instead.
0/0
Count Fenring U
Legendary Creature — Human Advisor (R)
Hexproof
1R: Count Fenring deals 1 damage to target creature.
1W: Prevent the next 1 damage that would be dealt to you.
1/2
Feyd-Rautha 3B
Legendary Creature — Human Rogue (R)
Deathtouch
2U: Target creature can’t be blocked this turn.
2G: Target creature gains hexproof until end of turn.
1/4
The Mad Baron 1B
Legendary Creature — Human Horror (R)
Flying
Whenever The Mad Baron deals combat damage to a player, choose a land you own and control. Defending player chooses a land they own and control. Exchange control of them.
2/1
Piter, Twisted Mentat 3BB
Legendary Creature — Human Spy (R)
Lurk (This creature can’t be blocked by creatures with power less than this creature’s toughness.)
Other creatures you control with power greater than their toughness gain lurk.
At the beginning of each player’s upkeep, destroy target creature with the lowest power.
5/3
Scytale, Ghola Master 1BB
Legendary Creature — Zombie (M)
T, Sacrifice a nontoken creature: Exile target creature card from your graveyard. Create Ghola, a legendary */* red Zombie Mutant creature token. It has, “This creature’s power and toughness are equal to the number of face-up creature cards you own in exile.”. It gains haste until end of turn. Exile the token at the beginning of your next upkeep.
1/1
The Waff Ghola BB
Legendary Creature — Vampire (R)
Flying
R, Sacrifice a creature with power 2 or less: Create a 3/1 red Zombie creature token with haste.
2/2
Beast Rabban 1R
Legendary Creature — Beast Human (R)
Brawl (Creatures blocking Rabban get -X/-0 this combat. X is Rabban's power.
1: Beast Rabban gets +1/+0 until end of turn.
2/1
Gurney Halleck, Smuggler 2R
Legendary Creature — Human Rogue (R)
Brawl (Creatures blocking Gurney get -X/-0 this combat. X is Gurney’s power.)
1W: Target attacking creature gets +1/+1 until end of turn.
2B: Target blocking creature gets -1/-1 until end of turn.
3/3
Odrade, Honored Matre 1RR
Legendary Creature — Rossak Witch (R)
Whenever Odrade, Honored Matre becomes blocked, create a token that’s a copy of her except it’s not legendary. It’s tapped, attacking, and unblocked. Exile it at the beginning of the next end step.
2/2
Stilgar, Tabir Naib 1RR
Legendary Creature — Fremen Naib (R)
Stalk (This creature must be blocked if able and can’t be blocked by more than one creature.)
As long as the number of basic land types an opponent controls is two or less, Fremen you control get +2/+2.
3/2
Thufir Hawat, Mentat 1R
Legendary Creature — Human Advisor (R)
Whenever you cast an instant or sorcery spell that targets only Thufir Hawat, Mentat, choose a color at random. If the spell is the chosen color, copy that spell for each other creature you control that spell could target. Each copy targets a different one of those creatures.
1/3
Doctor Yueh 2G
Legendary Creature — Human Scientist (R)
Lifetouch
3R: Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn.
4U: Exchange control of two target creatures.
0/5
Lady Jessica of Caladan G
Legendary Creature — Human Witch (R)
Weirding
At the beginning of each player’s postcombat main phase, that player adds U.
2/1
Lyet Kynes, Planetologist 1GG
Legendary Creature — Fremen Advisor (R)
Other green creatures and Forests you control have, “T: Add GG.”.
1/2
Paul of the Golden Path 2GG
Legendary Creature — Human God (M)
Weirding, indestructible
Creature spells cost 2 less to cast.
2/2
Duncan, The One 1WUBRG
Legendary Creature — Human God (R)
Duncan, The One has power and toughness equal to the number of permanents on the battlefield.
If Duncan would leave the battlefield, shuffle him into your library and draw a card instead.
*/*
Leto II, The Tyrant WUBRG
Legendary Creature — Wurm Human (R)
When Leto II, The Tyrant enters the battlefield, create a 5/5 green Wurm creature token.
When Leto II dies, create five 1/1 green Wurm creature tokens.
Sacrifice five Wurms, exile Leto II: You may cast any number of Wurm creature cards from your graveyard and/or hand without paying their mana costs. You may activate this ability from your graveyard.
5/5
Omnius WWUUBBRRGG
Legendary Creature — Brain (R)
Omnius is also in your hand, graveyard, library, and exile.
20/20
Cogitor Eklo 8
Legendary Artifact Creature — Brain (R)
Lifelink, indestructible
Other artifact creatures you control gain lifelink, and have base power and toughness 4/4.
If Cogitor Eklo would die, you may exile a Brain you control instead.
1/7
Tlaloc, The Titan 9
Legendary Artifact Creature — Brain (R)
Flying, indestructible
Other artifact creatures you control gain flying, and have base power and toughness 4/4.
If Tlaloc, The Titan would die, you may exile two Brains you control instead.
7/2
Aw, no Erasmus. What a shame.
Um, how does Omnius work, exactly? Masterful Ninja is the next closest, with the ability to be discarded while on the battlefield and all, but how does being in the graveyard and on the battlefield work here?
Erasmus Unsyncronized UBRG
Legendary Planeswalker — Erasmus (M)
Starting Loyalty: 6
+1: Untap up to one target land you control for each creature card in your graveyard.
-2: Sacrifice a creature. If you do, destroy two target creatures.
-8: Create a 3/1 red Zombie Mutant creature token with haste for each creature card in target opponent’s graveyard.
Iblis, Jihad Conspirator WUBR
Legendary Planeswalker — Iblis (M)
Starting Loyalty: 4
0: Create a 0/1 colorless Brain artifact creature token with indestructible.
0: Target Brain creature has base power and toughness 4/4.
0: Destroy all creatures. Sacrifice Iblis, Jihad Conspirator.
The Oracle of Time RGWU
Legendary Planeswalker — Oracle (M)
Starting Loyalty: 2
+2: Put a creature card with converted mana cost less than the number of loyalty counters on The Oracle of Time from your hand onto the battlefield under your control.
-1: You get an emblem with, “Creatures you control get +1/+1 and gain haste.”.
-12: Restart the game leaving all emblems you own in the command zone.
Serena, Jihad Princess BRGW
Legendary Planeswalker — Serena (M)
Starting Loyalty: 3
+1: Choose a creature you control and an opponent. That player chooses a creature he or she controls. Exchange control of the chosen creatures.
-1: Target creature you control fights target creature you don’t control.
-6: You get an emblem with, “Creatures you own but don’t control can’t attack you.”
Tio, Enigmatic Genius GWUB
Legendary Planeswalker — Tio (M)
Starting Loyalty: 5
+1: Put a +1/+1 counter on up to two target creatures you control.
+1: Activate each activated ability of creatures you control with +1/+1 counters on them.
-8: You get an emblem with, “Whenever one or more creatures attack you, exile target nonland permanent.”
[i]
Omnius is inspired by a card inspired by a Steve Jackson game (lol) called Illuminati. This card exists in all zones at all times. This is the potentially workable version although honestly im not sure all of the ins and outs. I guess you couldn't sacrifice it or exile it or discard it...it just stays there on the battlefield no matter what.
Edit: You have to get it on the battlefield first before it's in any other zones.
Lifetouch (Damage dealt to this creature also causes you to gain that much life.)
Deathlink (Damage dealt to this creature also causes that source's controller to lose that much life.)
General Miles Teg 2W
Legendary Creature — Rossak Bashar (M)
If a nontoken creature you control would die, if it’s enchanted, exile that creature and all Auras attached to it instead. Create a token that’s a copy of that creature, except it’s a white Spirit in addition to it’s other types, and it has no mana cost. Put the exiled Aura cards onto the battlefield under your control attached to the token.
3/3
Mohaim, Reverend Mother 1W
Legendary Creature — Rossak Witch (R)
Weirding (This creature can attack and block while tapped.)
T: Remove target attacking or blocking creature from combat.
0/3
Murbella of the New Sisterhood W
Legendary Creature — Rossak Witch (R)
Weirding
The first spell each player casts each turn costs 1 more to cast.
1/2
Shaihulud 4WW
Legendary Creature — Wurm God (M)
Weirding, lifetouch, deathlink
Shaihulud can block any number of creatures.
All creatures able to block Shaihulud do so.
If Shaihulud would leave the battlefield, shuffle it into it’s owner’s library instead.
6/6
Shaitan 3WW
Legendary Creature — Wurm God (M)
Shaitan enters the battlefield with five +1/+1 counters on it.
1G, Remove a +1/+1 counter from Shaitan: Create a 1/1 green Wurm creature token.
3B, Sacrifice a creature: Destroy target creature.
If Shaitan would leave the battlefield, shuffle it into it’s owner’s library instead.
0/0
Count Fenring U
Legendary Creature — Human Advisor (R)
Hexproof
1R: Count Fenring deals 1 damage to target creature.
1W: Prevent the next 1 damage that would be dealt to you.
1/2
Feyd-Rautha 3B
Legendary Creature — Human Rogue (R)
Deathtouch
2U: Target creature can’t be blocked this turn.
2G: Target creature gains hexproof until end of turn.
1/4
The Mad Baron 1B
Legendary Creature — Human Horror (R)
Flying
Whenever The Mad Baron deals combat damage to a player, choose a land you own and control. Defending player chooses a land they own and control. Exchange control of them.
2/1
Piter, Twisted Mentat 3BB
Legendary Creature — Human Spy (R)
Lurk (This creature can’t be blocked by creatures with power less than this creature’s toughness.)
Other creatures you control with power greater than their toughness gain lurk.
At the beginning of each player’s upkeep, destroy target creature with the lowest power.
5/3
Scytale, Ghola Master 1BB
Legendary Creature — Zombie (M)
T, Sacrifice a nontoken creature: Exile target creature card from your graveyard. Create Ghola, a legendary */* red Zombie Mutant creature token. It has, “This creature’s power and toughness are equal to the number of face-up creature cards you own in exile.”. It gains haste until end of turn. Exile the token at the beginning of your next upkeep.
1/1
The Waff Ghola BB
Legendary Creature — Vampire (R)
Flying
R, Sacrifice a creature with power 2 or less: Create a 3/1 red Zombie creature token with haste.
2/2
Beast Rabban 1R
Legendary Creature — Beast Human (R)
Brawl (Creatures blocking Rabban get -X/-0 this combat. X is Rabban's power.
1: Beast Rabban gets +1/+0 until end of turn.
2/1
Gurney Halleck, Smuggler 2R
Legendary Creature — Human Rogue (R)
Brawl (Creatures blocking Gurney get -X/-0 this combat. X is Gurney’s power.)
1W: Target attacking creature gets +1/+1 until end of turn.
2B: Target blocking creature gets -1/-1 until end of turn.
3/3
Odrade, Honored Matre 1RR
Legendary Creature — Rossak Witch (R)
Whenever Odrade, Honored Matre becomes blocked, create a token that’s a copy of her except it’s not legendary. It’s tapped, attacking, and unblocked. Exile it at the beginning of the next end step.
2/2
Stilgar, Tabir Naib 1RR
Legendary Creature — Fremen Naib (R)
Stalk (This creature must be blocked if able and can’t be blocked by more than one creature.)
As long as the number of basic land types an opponent controls is two or less, Fremen you control get +2/+2.
3/2
Thufir Hawat, Mentat 1R
Legendary Creature — Human Advisor (R)
Whenever you cast an instant or sorcery spell that targets only Thufir Hawat, Mentat, choose a color at random. If the spell is the chosen color, copy that spell for each other creature you control that spell could target. Each copy targets a different one of those creatures.
1/3
Doctor Yueh 2G
Legendary Creature — Human Scientist (R)
Lifetouch
3R: Untap target creature and gain control of it until end of turn. That creature gains haste until end of turn.
4U: Exchange control of two target creatures.
0/5
Lady Jessica of Caladan G
Legendary Creature — Human Witch (R)
Weirding
At the beginning of each player’s postcombat main phase, that player adds U.
2/1
Lyet Kynes, Planetologist 1GG
Legendary Creature — Fremen Advisor (R)
Other green creatures and Forests you control have, “T: Add GG.”.
1/2
Paul of the Golden Path 2GG
Legendary Creature — Human God (M)
Weirding, indestructible
Creature spells cost 2 less to cast.
2/2
Duncan, The One 1WUBRG
Legendary Creature — Human God (R)
Duncan, The One has power and toughness equal to the number of permanents on the battlefield.
If Duncan would leave the battlefield, shuffle him into your library and draw a card instead.
*/*
Leto II, The Tyrant WUBRG
Legendary Creature — Wurm Human (R)
When Leto II, The Tyrant enters the battlefield, create a 5/5 green Wurm creature token.
When Leto II dies, create five 1/1 green Wurm creature tokens.
Sacrifice five Wurms, exile Leto II: You may cast any number of Wurm creature cards from your graveyard and/or hand without paying their mana costs. You may activate this ability from your graveyard.
5/5
Omnius WWUUBBRRGG
Legendary Creature — Brain (R)
Omnius is also in your hand, graveyard, library, and exile.
20/20
Cogitor Eklo 8
Legendary Artifact Creature — Brain (R)
Lifelink, indestructible
Other artifact creatures you control gain lifelink, and have base power and toughness 4/4.
If Cogitor Eklo would die, you may exile a Brain you control instead.
1/7
Tlaloc, The Titan 9
Legendary Artifact Creature — Brain (R)
Flying, indestructible
Other artifact creatures you control gain flying, and have base power and toughness 4/4.
If Tlaloc, The Titan would die, you may exile two Brains you control instead.
7/2
Um, how does Omnius work, exactly? Masterful Ninja is the next closest, with the ability to be discarded while on the battlefield and all, but how does being in the graveyard and on the battlefield work here?
Erasmus Unsyncronized UBRG
Legendary Planeswalker — Erasmus (M)
Starting Loyalty: 6
+1: Untap up to one target land you control for each creature card in your graveyard.
-2: Sacrifice a creature. If you do, destroy two target creatures.
-8: Create a 3/1 red Zombie Mutant creature token with haste for each creature card in target opponent’s graveyard.
Iblis, Jihad Conspirator WUBR
Legendary Planeswalker — Iblis (M)
Starting Loyalty: 4
0: Create a 0/1 colorless Brain artifact creature token with indestructible.
0: Target Brain creature has base power and toughness 4/4.
0: Destroy all creatures. Sacrifice Iblis, Jihad Conspirator.
The Oracle of Time RGWU
Legendary Planeswalker — Oracle (M)
Starting Loyalty: 2
+2: Put a creature card with converted mana cost less than the number of loyalty counters on The Oracle of Time from your hand onto the battlefield under your control.
-1: You get an emblem with, “Creatures you control get +1/+1 and gain haste.”.
-12: Restart the game leaving all emblems you own in the command zone.
Serena, Jihad Princess BRGW
Legendary Planeswalker — Serena (M)
Starting Loyalty: 3
+1: Choose a creature you control and an opponent. That player chooses a creature he or she controls. Exchange control of the chosen creatures.
-1: Target creature you control fights target creature you don’t control.
-6: You get an emblem with, “Creatures you own but don’t control can’t attack you.”
Tio, Enigmatic Genius GWUB
Legendary Planeswalker — Tio (M)
Starting Loyalty: 5
+1: Put a +1/+1 counter on up to two target creatures you control.
+1: Activate each activated ability of creatures you control with +1/+1 counters on them.
-8: You get an emblem with, “Whenever one or more creatures attack you, exile target nonland permanent.”
[i]
Omnius is inspired by a card inspired by a Steve Jackson game (lol) called Illuminati. This card exists in all zones at all times. This is the potentially workable version although honestly im not sure all of the ins and outs. I guess you couldn't sacrifice it or exile it or discard it...it just stays there on the battlefield no matter what.
Edit: You have to get it on the battlefield first before it's in any other zones.