Remove Soul

Boomerang

Return target permanent to its owner's hand.

Island

Flying Men

Phantasmal Forces

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

Zephyr Falcon

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.

Prodigal Sorcerer

{T}: This creature deals 1 damage to any target.

Sunken City

At the beginning of your upkeep, sacrifice this enchantment unless you pay {U}{U}.
Blue creatures get +1/+1.

Counterspell

Unsummon

Return target creature to its owner's hand.

Force Spike

Counter target spell unless its controller pays {1}.