Glacial Wall

Boomerang

Return target permanent to its owner's hand.

Counterspell

Remove Soul

Zephyr Falcon

Prodigal Sorcerer

{T}: Prodigal Sorcerer deals 1 damage to any target.

Time Walk

Brainstorm

Draw three cards, then put two cards from your hand on top of your library in any order.

Phantom Monster

Island

Unsummon

Return target creature to its owner's hand.

Leviathan

Trample
Leviathan enters tapped and doesn't untap during your untap step.
At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap Leviathan.
Leviathan can't attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)