Ixalan

Captain Lannery Storm | Legendary Creature | Human Pirate | Haste Whenever Captain Lannery Storm attacks, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") Whenever you sacrifice a Treasure, Captain Lannery Storm gets +1/+0 until end of turn. | Chris Rallis

Rampaging Ferocidon | Creature | Dinosaur | Menace Players can't gain life. Whenever another creature enters the battlefield, Rampaging Ferocidon deals 1 damage to that creature's controller. | Jonathan Kuo

Repeating Barrage | Sorcery | | Repeating Barrage deals 3 damage to any target. Raid — {3}{R}{R}: Return Repeating Barrage from your graveyard to your hand. Activate only if you attacked this turn. | Dan Scott

Tilonalli's Skinshifter | Creature | Human Shaman | Haste Whenever Tilonalli's Skinshifter attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn. | Jason Rainville