Equilibrium

Whenever you cast a creature spell, you may pay {1}. If you do, return target creature to its owner's hand.

Thalakos Scout

Shadow (This creature can block or be blocked by only creatures with shadow.)
Discard a card: Return Thalakos Scout to its owner's hand.

Cloud Spirit

Flying
Cloud Spirit can block only creatures with flying.

Mind Games

Buyback {2}{U} (You may pay an additional {2}{U} as you cast this spell. If you do, put this card into your hand as it resolves.)
Tap target artifact, creature, or land.

Propaganda

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Capsize

Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Return target permanent to its owner's hand.

Mana Leak

Counter target spell unless its controller pays {3}.

Wayward Soul

Flying
{U}: Put Wayward Soul on top of its owner's library.

Mirozel

Flying
When Mirozel becomes the target of a spell or ability, return Mirozel to its owner's hand.

Time Ebb

Put target creature on top of its owner's library.

Killer Whale

{U}: Killer Whale gains flying until end of turn.

Erratic Portal

{1}, {T}: Return target creature to its owner's hand unless its controller pays {1}.

Dominating Licid

{1}{U}{U}, {T}: Dominating Licid loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay {U} to end this effect.
You control enchanted creature.

Fade Away

For each creature, its controller sacrifices a permanent unless they pay {1}.

Treasure Trove

Legacy's Allure

At the beginning of your upkeep, you may put a treasure counter on Legacy's Allure.
Sacrifice Legacy's Allure: Gain control of target creature with power less than or equal to the number of treasure counters on Legacy's Allure. (This effect lasts indefinitely.)

Counterspell

Island

Forbid

Buyback—Discard two cards. (You may discard two cards in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
Counter target spell.