Put a +1/+1 counter on target creature you control. Then that creature deals damage equal to its power to target creature or planeswalker you don't control.

Trample
When this creature enters, you may search your library and/or graveyard for a card named Domri, City Smasher, reveal it, and put it into your hand. If you search your library this way, shuffle.

Each creature you control but don't own gets +2/+2, has menace and deathtouch, and is a Pirate in addition to its other types.
Whenever you cast a noncreature spell you don't own, create two tapped Treasure tokens.

Vigilance
At the beginning of your end step, exile up to one target artifact you control and up to one target creature you control. Then return them to the battlefield under their owners' control.

Menace
Whenever Don & Raph attack, the next noncreature spell you cast this turn has affinity for artifacts.

Whenever you cast a nonlegendary creature spell with flying, you may copy it, except the copy is a 1/1 Spirit in addition to its other types. Do this only once each turn. (The copy becomes a token.)

Lifelink
Power-up — : Put two +1/+1 counters and a flying counter on Donald Blake. He becomes a God Warrior Hero. (He loses all other creature types.)

Target player gains control of target permanent you control.

Sneak
Whenever Donatello deals combat damage to a player, create a token that's a copy of target artifact you control.

: Put three +1/+1 counters on target artifact you control. If it isn't a creature, it becomes a 0/0 Robot creature in addition to its other types. Activate only as a sorcery.
Whenever an artifact you control is put into a graveyard from the battlefield, if it had counters on it, put those counters on up to one target artifact or creature you control.

Vigilance
When Donatello enters, tap up to three target creatures your opponents control. Put a stun counter on each of them.

If one or more tokens would be created under your control, those tokens plus a Mutagen token are created instead.
Partner — Character select

When Donatello enters, if you control an artifact, draw a card.

Flying
Whenever an artifact you control enters, put a +1/+1 counter on Donatello.

Tap up to two target creatures. Up to two target players each draw a card.

Sneak
Draw two cards.

At the beginning of your end step, if you control an Employee, a Performer, or a Robot, you may get or create a Treasure token. If you control all three, you may put a sticker on a nonland permanent you own.

When Dong Zhou enters, target creature an opponent controls deals damage equal to its power to that player.

Soulbond
Whenever Donna Noble or a creature it's paired with is dealt damage, Donna Noble deals that much damage to target opponent.
Doctor's companion (You can have two commanders if the other is the Doctor.)

When Donnie & April enter, choose one or both. Each mode must target a different player.
• Target player draws two cards.
• Target player returns an artifact, instant, or sorcery card from their graveyard to their hand.

Until end of turn, if one or more creatures would enter from exile or after being cast from exile, their owners shuffle them into their libraries instead.
Cycling

Counter target spell unless its controller pays . If they do, surveil 2.

Destroy all tapped creatures. Until your next turn, whenever a creature becomes tapped, destroy it.

Whenever a hot source you control would deal damage, it deals that much damage plus 1 instead. (Something is hot if it has hot things in its art, like fire or explosions.)
, Sacrifice Don't Try This at Home: It deals damage equal to twice the number of hot cards in your graveyard to target creature or planeswalker.

Enchant card in your hand (This Aura remains on the battlefield. If you play enchanted card or it otherwise leaves your hand, put this Aura into the graveyard.)
Enchanted card costs less to cast.
When you cast enchanted card, copy it.

Combine Doomsday with Doctor Doom to win the game in a single masterstroke.

Destroy target nonblack creature.

As this artifact enters, choose a creature type.
, , Sacrifice a creature of the chosen type: This artifact deals 3 damage to any target.

At the beginning of each player's upkeep, that player sacrifices a nonland, nontoken permanent of their choice. If that player can't, they discard a card, they lose 2 life, you draw a card, you gain 2 life, you create a 2/2 white Knight creature token with vigilance, then you sacrifice this enchantment.