Changeling (This card is every creature type.): Until end of turn, creatures you control have base power and toughness X/X and gain all creature types.
: Target Merfolk creature gets +1/+1 and gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.): Target land becomes an Island until end of turn.
Reveal cards from the top of your library until you reveal three nonland cards. Put the nonland cards revealed this way into your hand, then put the rest of the revealed cards on the bottom of your library in any order.
FlyingWhen Marsh Flitter enters, create two 1/1 black Goblin Rogue creature tokens.Sacrifice a Goblin: Marsh Flitter has base power and toughness 3/3 until end of turn.
FlyingIf noncombat damage would be dealt to you, prevent that damage. You gain life equal to the damage prevented this way.When Purity is put into a graveyard from anywhere, shuffle it into its owner's library.
Changeling (This card is every creature type.)Champion a creature (When this enters, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)Lifelink (Damage dealt by this creature also causes you to gain that much life.)
When Mournwhelk enters, target player discards two cards.Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)