Unsummon

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.

Counterspell

Island

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.

Sol Ring

Control Magic

Enchant creature
You control enchanted creature.

Phantasmal Forces

Flying
At the beginning of your upkeep, sacrifice Phantasmal Forces unless you pay {U}.

Boomerang

Return target permanent to its owner's hand.

Force Spike

Counter target spell unless its controller pays {1}.

Merfolk of the Pearl Trident

Ornithopter

Spell Blast

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

Mana Short

Tap all lands target player controls and that player loses all unspent mana.

Phantom Monster

Howling Mine

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

Twiddle

You may tap or untap target artifact, creature, or land.

Air Elemental

Zephyr Falcon

Mishra's Factory

{T}: Add {C}.
{1}: Mishra's Factory becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Flood

{U}{U}: Tap target creature without flying.

Siren's Call

Cast this spell only during an opponent's turn, before attackers are declared.
Creatures the active player controls attack this turn if able.
At the beginning of the next end step, destroy all non-Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.

Vodalian Mage

{U}, {T}: Counter target spell unless its controller pays {1}.

Soul Barrier

Whenever an opponent casts a creature spell, Soul Barrier deals 2 damage to that player unless they pay {2}.

Remove Soul

Serendib Efreet

Flying
At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

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