
Elusive Krasis | Creature | Fish Mutant | Elusive Krasis can't be blocked.
Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) | Wesley Burt

Nimbus Swimmer | Creature | Leviathan | Flying
Nimbus Swimmer enters the battlefield with X +1/+1 counters on it. | Howard Lyon

Simic Charm | Instant | | Choose one —
• Target creature gets +3/+3 until end of turn.
• Permanents you control gain hexproof until end of turn.
• Return target creature to its owner's hand. | Zoltan Boros

Urban Evolution | Sorcery | | Draw three cards. You may play an additional land this turn. | Eytan Zana

Zameck Guildmage | Creature | Elf Wizard | {G}{U}: This turn, each creature you control enters the battlefield with an additional +1/+1 counter on it.
{G}{U}, Remove a +1/+1 counter from a creature you control: Draw a card. | Chase Stone

Merfolk of the Depths | Creature | Merfolk Soldier | Flash (You may cast this spell any time you could cast an instant.) | Scott Chou

Simic Keyrune | Artifact | | {T}: Add {G} or {U}.
{G}{U}: Simic Keyrune becomes a 2/3 green and blue Crab artifact creature with hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.) | Daniel Ljunggren