Counterspell

War Barge

{3}: Target creature gains islandwalk until end of turn. When War Barge leaves the battlefield this turn, destroy that creature. A creature destroyed this way can't be regenerated. (A creature with islandwalk can't be blocked as long as defending player controls an Island.)

Cancel

Boomerang

Return target permanent to its owner's hand.

Millstone

Maze of Ith

{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

Ghost Ship

Tormod's Crypt

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Prodigal Sorcerer

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

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.

Remove Soul

Steal Artifact

Enchant artifact
You control enchanted artifact.

Persuasion

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
You control enchanted creature.

Clone

You may have Clone enter as a copy of any creature on the battlefield.

Island

Ambassador Laquatus

Air Elemental

Feldon's Cane

{T}, Exile Feldon's Cane: Shuffle your graveyard into your library.

Merfolk Assassin

{T}: Destroy target creature with islandwalk.

Mahamoti Djinn

Flying (This creature can't be blocked except by creatures with flying or reach.)