Justu, the Shrouded Mirror1UBR
Legendary Creature -- Elemental Wizard
Whenever an opponent casts an instant or sorcery spell, you may pay 2. If you do, copy that spell and you may choose new targets for the copy.
Whenever a nonland, nontoken permanent enters the battlefield under an opponent's control, you may pay 2. If you do, create a token that's a copy of that permanent.
Janan, Double Agent1RW
Legendary Creature -- Dwarf Artificer
At the beginning of your upkeep, you may discard a card. If you do, return target artifact or enchantment card from your graveyard to your hand. t, Sacrifice an artifact or enchantment: You may put an artifact or enchantment card with converted mana cost X or less from your hand onto the battlefield, where X is the converted mana cost of the permanent sacrificed this way plus 2.
Next: A 1-mana commander that's mono-blue or mono-black.
Ea, the Cosmos AlignedWUBRG
Legendary Creature -- Avatar t, Sacrifice another white permanent, another blue permanent, another black permanent, another red permanent and another green permanent: If exactly five permanents were sacrificed this way, draw five cards and an extra turn after this one. Ea, the Cosmos Aligned doesn't untap during that turn's untap step.
Astaram, Preserver of Vitality1GW
Legendary Creature -- Elemental
Whenever an opponent casts a noncreature spell, put a +1/+1 counter on Astaram, Preserver of Vitality.
Your opponents can't cast noncreature spells with converted mana cost equal to or less than the number of +1/+1 counters on Astaram. GW, Remove a +1/+1 counter from Astaram: Astaram gains hexproof and indestructible until end of turn.
Next: A Rakdos or Gruul commander with a card-drawing ability.
They left a lot of the "spreading the curse" aspect of werewolves untouched, let's see what we can do with that.
Narissa, Rabid Hunter2RG
Legendary Creature -- Human Werewolf
Whenever Narissa, Rabid Hunter deals damage to a creature, that creature becomes a Werewolf in addition to its other types. G: Target creature blocks Narissa this turn if able. Only that creature can block Narissa this turn. Activate this ability only once each turn.
At the beginning of each upkeep, if no spells were cast last turn, transform Narissa.
Narissa, Mother of the Pack
Legendary Creature -- Werewolf (color ID: (R/G))
Whenever this creature transforms into Narissa, Lunar Predator, gain control of all Wolves and Werewolves, then put a +1/+1 counter on each creature you control that's a Wolf or Werewolf. Untap those creatures. They gain haste.
Whenever an opponent casts a spell, Narissa deals damage to that player equal to the number of Wolves and Werewolves you control.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform Narissa.
Super cluttered, but I guess it's something like what werewolf fans want? I dunno lol.
Next: A one-drop commander who's blue and/or black (no other colors).
Gadir, Faceless Illusionist1GUR
Legendary Creature -- Frog Shaman
Gadir, Faceless Illusionist gets -X/-0, where X is the number of cards in hand of your opponent with the greatest number of cards in hand.
Whenever Gadir attacks and isn't blocked, you may cast a nonland card with converted mana cost X or less from your hand without paying its mana cost, where X is 5 minus Gadir's power.
Next: A commander with an ability relating to regenerating with black in its colour identity.
Legendary Creature -- Ogre Shaman
Permanents your opponents control lose indestructible and can't have or gain indestructible. The same is also true for hexproof, shroud and protection. xBRG, t: Destroy target nonland permanent with converted mana cost X. Gaur Doomflame deals X damage to that permanent's controller.
Next: Grixis has a surprising lack of control commanders that interact directly with anything in play. Make one.
Legendary Creature -- Fish Mutant Wizard 1UG, t: Put an X/X blue and green Ooze token with "This creature enters the battlefield with a +1/+1 counter on it" onto the battlefield, where X is the greatest power among creatures you control.
Kawamura, Notorious Ronin3B
Legendary Creature -- Human Samurai
Bushido 2 R: Target creature blocks this turn if able. Activate this ability only if Kawamura, Notorious Ronin is attacking.
When a creature blocking or blocked by Kawamura dies, flip Kawamura.
Chiyubi, Disgraced Blade
Legendary Artifact -- Equipment
Equipped creature gets +2/+2. R: Target creature blocks this turn if able. Activate this ability only if equipped creature is attacking.
Whenever equipped creature becomes blocked by one or more creatures, that player sacrifices all non-blocking untapped creatures he or she controls.
Equip 3, Pay 1 life.
I didn't want to do it, but I don't see another way for black...
Forzana, Cabal's Chosen3BB
Legendary Creature -- Spirit Minion 4BBB, t, Sacrifice Forzana, Cabal's Chosen: Separate all nonland permanents target opponent controls into two piles. That player chooses one of those piles and sacrifices all permanents in that pile.
Next: Make a card for Alhammarret that's not awful
Ghirr, Anima's Chosen3RGW
Legendary Creature -- Beast
Creatures with power 4 or less can't attack.
Nonland permanents with converted mana cost 4 or less don't untap during their controller's untap step.
Get'Tuk, Scion of the Deathkeeper1BR
Legendary Creature -- Orc Shaman
Whenever a creature enters the battlefield under your control from a graveyard, that creature deals damage equal to its power to target creature or player and gains haste until end of turn.
Shulga the Chronophagos3BGU
Legendary Creature -- Horror
Whenever Shulga the Chronophagos deals combat damage to a player, draw cards equal to the number of cards in that player's graveyard.
Discard two cards: Put a +1/+1 counter on Shulga.
Next: A commander who cares about shadow (the ability).
Derszek, Rix Maadi Necromancer2BR
Legendary Creature -- Human Shaman
If you would draw a card, you may skip that draw instead. t: Return target creature card with converted mana cost X or less from your graveyard to the battlefield, where X is 7 minus the number of cards in your hand. That creature gains haste. Return it to your hand at the beginning of the next end step.
Next: A commander that gives you an alternate win condition and an alternate lose condition.