Snapback

You may exile a blue card from your hand rather than pay this spell's mana cost.
Return target creature to its owner's hand.

Awoken Horror

When this creature transforms into Awoken Horror, return all non-Horror creatures to their owners' hands.

Thing in the Ice

Defender
Thing in the Ice enters with four ice counters on it.
Whenever you cast an instant or sorcery spell, remove an ice counter from Thing in the Ice. Then if it has no ice counters on it, transform it.

Thing in the Ice // Awoken Horror

Rise from the Tides

Create a tapped 2/2 black Zombie creature token for each instant and sorcery card in your graveyard.

Counterspell

Anticipate

Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Unwind

Counter target noncreature spell. Untap up to three lands.

Evacuation

Return all creatures to their owners' hands.

Prism Ring

As Prism Ring enters, choose a color.
Whenever you cast a spell of the chosen color, you gain 1 life.

Scry 1. (Look at the top card of your library. You may put that card on the bottom.)
Draw a card.

Spell Snare

Sapphire Medallion

Blue spells you cast cost {1} less to cast.

Island

Stern Dismissal

Return target creature or enchantment an opponent controls to its owner's hand.