Journey into Nyx

Crystalline Nautilus | Enchantment Creature | Nautilus | Bestow {3}{U}{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.) When Crystalline Nautilus becomes the target of a spell or ability, sacrifice it. Enchanted creature gets +4/+4 and has "When this creature becomes the target of a spell or ability, sacrifice it." | Brad Rigney

Dakra Mystic | Creature | Merfolk Wizard | {U}, {T}: Each player reveals the top card of their library. You may put the revealed cards into their owners' graveyards. If you don't, each player draws a card. | Wesley Burt

Riptide Chimera | Enchantment Creature | Chimera | Flying At the beginning of your upkeep, return an enchantment you control to its owner's hand. | Ryan Barger

Triton Cavalry | Creature | Merfolk Soldier | Heroic — Whenever you cast a spell that targets Triton Cavalry, you may return target enchantment to its owner's hand. | Kev Walker

Whitewater Naiads | Enchantment Creature | Nymph | Constellation — Whenever Whitewater Naiads or another enchantment enters the battlefield under your control, target creature can't be blocked this turn. | William Wu

Disciple of Deceit | Creature | Human Rogue | Inspired — Whenever Disciple of Deceit becomes untapped, you may discard a nonland card. If you do, search your library for a card with the same mana value as that card, reveal it, put it into your hand, then shuffle. | Daarken

Stormchaser Chimera | Creature | Chimera | Flying {2}{U}{R}: Scry 1, then reveal the top card of your library. Stormchaser Chimera gets +X/+0 until end of turn, where X is that card's mana value. (To scry 1, look at the top card of your library, then you may put that card on the bottom of your library.) | Greg Staples

Fleetfeather Cockatrice | Creature | Cockatrice | Flash (You may cast this spell any time you could cast an instant.) Flying, deathtouch {5}{G}{U}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) | Matt Stewart