Crackling Triton | Creature | Merfolk Wizard | {2}{R}, Sacrifice Crackling Triton: It deals 2 damage to any target. | Greg Staples
Meletis Charlatan | Creature | Human Wizard | {2}{U}, {T}: The controller of target instant or sorcery spell copies it. That player may choose new targets for the copy. | Jason A. Engle
Nimbus Naiad | Enchantment Creature | Nymph | Bestow {4}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Flying
Enchanted creature gets +2/+2 and has flying. | David Palumbo
Thassa, God of the Sea | Legendary Enchantment Creature | God | Indestructible
As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.)
At the beginning of your upkeep, scry 1.
{1}{U}: Target creature you control can't be blocked this turn. | Jason Chan
Triton Fortune Hunter | Creature | Merfolk Soldier | Heroic — Whenever you cast a spell that targets Triton Fortune Hunter, draw a card. | Clint Cearley
Wavecrash Triton | Creature | Merfolk Wizard | Heroic — Whenever you cast a spell that targets Wavecrash Triton, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step. | Ryan Barger
Agent of Horizons | Creature | Human Rogue | {2}{U}: Agent of Horizons can't be blocked this turn. | Clint Cearley
Daxos of Meletis | Legendary Creature | Human Soldier | Daxos of Meletis can't be blocked by creatures with power 3 or greater.
Whenever Daxos of Meletis deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell. | Karla Ortiz
Spellheart Chimera | Creature | Chimera | Flying, trample
Spellheart Chimera's power is equal to the number of instant and sorcery cards in your graveyard. | Svetlin Velinov