Mutant Lands cycle
Land
Mutant Lands cycle enters the battlefield tapped.
When Mutant Lands cycle is put on your graveyard from the battlefield, create a 2/2 colorless creature token with all creature types. T: Add W or G.
Archaelogical Site (Mishra's Workshop is broken. Is this too?)
Legendary Land
Metalcraft — Pay 2 life, T: Add CCC. Activate this only if you control three or more artifacts.
Illusionary Oasis
Land T: Add C.
If Illusionary Oasis would leave the battlefield, transform it instead.
// Undiscovered Oasis
Land
Indestructible T: Add one mana of any color.
Supercharged Rock3
Artifact
Whenever you cast a multicolored spell, untap Supercharged Rock. T: Add one mana of any color.
Urza's Academy Dragon7
Legendary Artifact Creature - Dragon
Flying T: Add C for each colorless card in your graveyard.
5/5
Terrain Scales3
Artifact
Whenever a land enters the battlefield, if that land’s controller had another land enter the battlefield under their control this turn, that player sacrifices a land.
Lotus Shard0
Artifact T, Sacrifice Lotus Shard: Add C. Activate this only if you control a permanent of one or more colors.
Frail Lotus0
Artifact T, Sacrifice Frail Lotus: Add one mana of any color. Activate this only if you control a legendary creature or planeswalker.
Mana FailureUU
Instant
Counter target spell unless its controller pays 3. If that spell is countered this way, exile it instead of putting it in its owner’s graveyard.
Mana Shortage1UU
Instant
Counter target spell. Tap target land. It doesn’t untap during its controller’s next untap step.
Leaking of ManaU
Instant
Discard a card. Counter target spell unless its controller pays X, where X is the discarded card’s converted mana cost.
Eternal Void1UU
Instant
Counter target spell. If it was legendary, draw a card.
Wizard's DenialUU
Instant
Counter target spell unless its controller pays 3. If you control a wizard, counter target spell instead.
Time SkipU
Instant
Counter target spell, activated or triggered ability. Skip your next turn.
Soul Bribery2U
Enchantment
If a creature would leave the battlefield, gain control of it instead and sacrifice Soul Bribery.
Robe of ImitationU
Enchantment - Aura
Enchant creature token
As Robe of Imitation enters the battlefield, choose a nontoken creature.
Enchanted creature is a copy of the chosen creature. If that creature leaves the battlefield, destroy Robe of Imitation.
Holy ClericWW (the same idea could be made in black or both white and black, adding life loss to it)
Creature - Human Cleric
Whenever a card is put in your graveyard, you may gain 1 life.
Whenever a card is exiled from your graveyard, you may gain 1 life.
2/2
Vanilla CreamW
Instant
Exile target creature that is enchanted or equipped.
Cleansing Winds1WW
Sorcery
Destroy all creatures which are equipped, enchanted or have counters on them.
Angelic PassageW
Enchantment
Whenever a creature you control dies, you gain 1 life. If you control an angel, you gain 3 life instead.
Angel of War3WW
Creature - Angel
Flying
Whenever a black or red creature attacks you, you gain 2 life and Angel of War deals 1 damage to it.
4/4
Mystic Academic3WW
Creature - Human Cleric
When Mystic Academic dies, reveal cards from the top of your library until you reveal an artifact or enchantment. Put it onto the battlefield and the rest in the bottom of your library in a random order.
3/4
Pure Fire1R
Instant
Pure Fire deals 2 damage to any target. If the target is white or blue, deals 3 damage instead. If the target is both white and blue, deals 5 damage instead.
Furious Academic3R
Creature - Human
When Furious Academic dies, exile the top 5 cards from your library. You may cast any instant or sorcery among them without paying its mana cost.
3/2
Underworld Voices1BB
Sorcery
Each player sacrifices a creature for each creature in their graveyard.
Killing IntentBB (too strong? Another idea is to make it exile only, but without morbid it can only hit CMC=2 and with morbid CMC=4, making it similar to Fatal Push)
Instant
Destroy target creature with converted mana cost 4 or less.
Morbid — Exile that creature instead if a creature died this turn.
Hex Field2BB
Enchantment
When Hex Field enters the battlefield, remove all counters from all creatures.
Creatures can’t gain counters.
Path to Nothing2B
Enchantment
Whenever you cast a black spell, target player exiles two cards from their graveyard. If that player can’t, they lose 2 life.
Act of DenialWU
Instant
Counter target artifact, creature or enchantment spell.
Arbiter of Purity3
Creature - Human Advisor
When Arbiter of Purity enters the battlefield, exile all auras and equipments.
Creatures can’t be enchanted or equipped.
3/3
Essence HarvestWB
Instant
Sacrifice up to 5 permanents. You gain 2 life for each permanent sacrificed this way.
Chance to LiveWG
Instant
Target player gains life equal to the highest converted mana cost among permanents on the battlefield.
If it’s not your turn, prevent all damage that would be dealt to you this turn.
Counter Lightning1RU (I made this before knowing about Ionize)
Instant
Counter target spell unless its controller pays 3. If that spell is countered this way, Counter Lightning deals 3 damage to any target.
Homeless4RB
Instant
Exile up to two target lands.
Vampiric Strike1WB (this card is a bit confusing)
Instant
Target creature gets +2/+2 and first strike until end of turn. If the creature blocking it dies, that creature’s controller loses 3 life. If the creature this creature is blocking dies, you gain 3 life.
TwinsealUR
Enchantment UR, Sacrifice Twinseal: Copy target instant or sorcery spell. You may choose new targets for the copy.
StopWWUU
Instant
Counter target spell. Tap all artifacts, creatures and lands of that spell’s controller.
PurgueWG
Sorcery
Exile target black permanent. You gain 5 life.
Prowess for All2WG
Enchantment
Whenever you cast a spell, target creature you control gets +2/+2 until end of turn.
Path to Destruction1UR
Instant
Path to Destruction can’t be countered by spells or abilities.
Counter target triggered or activated ability.
If a land’s or artifact’s ability is countered this way, destroy it.
Naked Skin
Instant
Destroy target aura or equipment.
Mirrored FireUR
Instant
Change the target of a spell or activated ability with a single target unless its controller pays 2.
Draw a card.
Reverse SpellWU
Instant
Counter target spell unless its controller pays 3. If that spell is countered this way, you gain 3 life.
Life Ressonance2
Enchantment
At the beginning of your upkeep, you may gain 1 life for each creature you control.
FlushWB
Instant
Discard your hand. You gain 2 life for each card discard this way.
Eat the Ashes1BG
Sorcery
Destroy target nonland permanent. You gain 3 life.
Angel of Fire1WR
Creature - Angel
Flying
When Angel of Fire enters the battlefield you gain 2 life.
When Angel of Fire dies, it deals 2 damage to any target.
2/2
Helena, Ghost Angel3BW
Legendary Creature - Angel Spirit
Flying, lifelink
Pay 4 life: Exile Helena, Ghost Angel. Return it to the battlefield at the beginning of your next upkeep.
4/4
Spiritual Bound 2WB
Enchantment
Creatures you control have lifelink. WB: Prevent all damage that would be dealt to target creature this turn. Whenever damage is prevented this way, you lose that much life.
Land
Mutant Lands cycle enters the battlefield tapped.
When Mutant Lands cycle is put on your graveyard from the battlefield, create a 2/2 colorless creature token with all creature types.
T: Add W or G.
Archaelogical Site (Mishra's Workshop is broken. Is this too?)
Legendary Land
Metalcraft — Pay 2 life, T: Add CCC. Activate this only if you control three or more artifacts.
Illusionary Oasis
Land
T: Add C.
If Illusionary Oasis would leave the battlefield, transform it instead.
//
Undiscovered Oasis
Land
Indestructible
T: Add one mana of any color.
Supercharged Rock 3
Artifact
Whenever you cast a multicolored spell, untap Supercharged Rock.
T: Add one mana of any color.
Urza's Academy Dragon 7
Legendary Artifact Creature - Dragon
Flying
T: Add C for each colorless card in your graveyard.
5/5
Terrain Scales 3
Artifact
Whenever a land enters the battlefield, if that land’s controller had another land enter the battlefield under their control this turn, that player sacrifices a land.
Lotus Shard 0
Artifact
T, Sacrifice Lotus Shard: Add C. Activate this only if you control a permanent of one or more colors.
Frail Lotus 0
Artifact
T, Sacrifice Frail Lotus: Add one mana of any color. Activate this only if you control a legendary creature or planeswalker.
Mana Failure UU
Instant
Counter target spell unless its controller pays 3. If that spell is countered this way, exile it instead of putting it in its owner’s graveyard.
Mana Shortage 1UU
Instant
Counter target spell. Tap target land. It doesn’t untap during its controller’s next untap step.
Leaking of Mana U
Instant
Discard a card. Counter target spell unless its controller pays X, where X is the discarded card’s converted mana cost.
Eternal Void 1UU
Instant
Counter target spell. If it was legendary, draw a card.
Wizard's Denial UU
Instant
Counter target spell unless its controller pays 3. If you control a wizard, counter target spell instead.
Time Skip U
Instant
Counter target spell, activated or triggered ability. Skip your next turn.
Soul Bribery 2U
Enchantment
If a creature would leave the battlefield, gain control of it instead and sacrifice Soul Bribery.
Robe of Imitation U
Enchantment - Aura
Enchant creature token
As Robe of Imitation enters the battlefield, choose a nontoken creature.
Enchanted creature is a copy of the chosen creature. If that creature leaves the battlefield, destroy Robe of Imitation.
Holy Cleric WW (the same idea could be made in black or both white and black, adding life loss to it)
Creature - Human Cleric
Whenever a card is put in your graveyard, you may gain 1 life.
Whenever a card is exiled from your graveyard, you may gain 1 life.
2/2
Vanilla Cream W
Instant
Exile target creature that is enchanted or equipped.
Cleansing Winds 1WW
Sorcery
Destroy all creatures which are equipped, enchanted or have counters on them.
Angelic Passage W
Enchantment
Whenever a creature you control dies, you gain 1 life. If you control an angel, you gain 3 life instead.
Angel of War 3WW
Creature - Angel
Flying
Whenever a black or red creature attacks you, you gain 2 life and Angel of War deals 1 damage to it.
4/4
Mystic Academic 3WW
Creature - Human Cleric
When Mystic Academic dies, reveal cards from the top of your library until you reveal an artifact or enchantment. Put it onto the battlefield and the rest in the bottom of your library in a random order.
3/4
Pure Fire 1R
Instant
Pure Fire deals 2 damage to any target. If the target is white or blue, deals 3 damage instead. If the target is both white and blue, deals 5 damage instead.
Furious Academic 3R
Creature - Human
When Furious Academic dies, exile the top 5 cards from your library. You may cast any instant or sorcery among them without paying its mana cost.
3/2
Underworld Voices 1BB
Sorcery
Each player sacrifices a creature for each creature in their graveyard.
Killing Intent BB (too strong? Another idea is to make it exile only, but without morbid it can only hit CMC=2 and with morbid CMC=4, making it similar to Fatal Push)
Instant
Destroy target creature with converted mana cost 4 or less.
Morbid — Exile that creature instead if a creature died this turn.
Hex Field 2BB
Enchantment
When Hex Field enters the battlefield, remove all counters from all creatures.
Creatures can’t gain counters.
Path to Nothing 2B
Enchantment
Whenever you cast a black spell, target player exiles two cards from their graveyard. If that player can’t, they lose 2 life.
Act of Denial WU
Instant
Counter target artifact, creature or enchantment spell.
Arbiter of Purity 3
Creature - Human Advisor
When Arbiter of Purity enters the battlefield, exile all auras and equipments.
Creatures can’t be enchanted or equipped.
3/3
Aurelia's Guard RRWW
Creature - Human Soldier
Double strike, lifelink, vigilance, haste
2/4
Essence Harvest WB
Instant
Sacrifice up to 5 permanents. You gain 2 life for each permanent sacrificed this way.
Chance to Live WG
Instant
Target player gains life equal to the highest converted mana cost among permanents on the battlefield.
If it’s not your turn, prevent all damage that would be dealt to you this turn.
Counter Lightning 1RU (I made this before knowing about Ionize)
Instant
Counter target spell unless its controller pays 3. If that spell is countered this way, Counter Lightning deals 3 damage to any target.
Homeless 4RB
Instant
Exile up to two target lands.
Vampiric Strike 1WB (this card is a bit confusing)
Instant
Target creature gets +2/+2 and first strike until end of turn. If the creature blocking it dies, that creature’s controller loses 3 life. If the creature this creature is blocking dies, you gain 3 life.
Twinseal UR
Enchantment
UR, Sacrifice Twinseal: Copy target instant or sorcery spell. You may choose new targets for the copy.
Stop WWUU
Instant
Counter target spell. Tap all artifacts, creatures and lands of that spell’s controller.
Purgue WG
Sorcery
Exile target black permanent. You gain 5 life.
Prowess for All 2WG
Enchantment
Whenever you cast a spell, target creature you control gets +2/+2 until end of turn.
Path to Destruction 1UR
Instant
Path to Destruction can’t be countered by spells or abilities.
Counter target triggered or activated ability.
If a land’s or artifact’s ability is countered this way, destroy it.
Naked Skin
Instant
Destroy target aura or equipment.
Mirrored Fire UR
Instant
Change the target of a spell or activated ability with a single target unless its controller pays 2.
Draw a card.
Reverse Spell WU
Instant
Counter target spell unless its controller pays 3. If that spell is countered this way, you gain 3 life.
Life Ressonance 2
Enchantment
At the beginning of your upkeep, you may gain 1 life for each creature you control.
Flush WB
Instant
Discard your hand. You gain 2 life for each card discard this way.
Eat the Ashes 1BG
Sorcery
Destroy target nonland permanent. You gain 3 life.
Angel of Fire 1WR
Creature - Angel
Flying
When Angel of Fire enters the battlefield you gain 2 life.
When Angel of Fire dies, it deals 2 damage to any target.
2/2
Helena, Ghost Angel 3BW
Legendary Creature - Angel Spirit
Flying, lifelink
Pay 4 life: Exile Helena, Ghost Angel. Return it to the battlefield at the beginning of your next upkeep.
4/4
Spiritual Bound 2WB
Enchantment
Creatures you control have lifelink.
WB: Prevent all damage that would be dealt to target creature this turn. Whenever damage is prevented this way, you lose that much life.
Illlusionary oasis
Angel of Fire
Helena, Ghost Angel
Eat the Ashes (Consume the Ashes?)
Life Resonance