Counterspell

Boomerang

Return target permanent to its owner's hand.

Clone

You may have Clone enter as a copy of any creature on the battlefield.

Unstable Mutation

Enchant creature
Enchanted creature gets +3/+3.
At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that creature.

Phantom Warrior

Remove Soul

Gilded Drake

Flying
When Gilded Drake enters, exchange control of Gilded Drake and up to one target creature an opponent controls. If you don't or can't make an exchange, sacrifice Gilded Drake. This ability still resolves if its target becomes illegal.

Control Magic

Enchant creature
You control enchanted creature.

Unsummon

Return target creature to its owner's hand.

Island

Seal of Removal

Sacrifice Seal of Removal: Return target creature to its owner's hand.

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.