Keyword: Morph

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Brine Elemental is turned face up, each opponent skips their next untap step.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Shaper Parasite is turned face up, target creature gets +2/-2 or -2/+2 until end of turn.

All Saprolings get +1/+1.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Thelonite Hermit is turned face up, create four 1/1 green Saproling creature tokens.

Hellbent — Gathan Raiders gets +2/+2 as long as you have no cards in hand.
Morph—Discard a card. (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Flying
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Morph—Return two Islands you control to their owner’s hand. (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Fathom Seer is turned face up, draw two cards.

Whenever Riptide Pilferer deals combat damage to a player, that player discards a card.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

This spell can’t be countered.
Flying, trample, protection from white and from blue
: Akroma, Angel of Fury gets +1/+0 until end of turn.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

As Vesuvan Shapeshifter enters the battlefield or is turned face up, you may choose another creature on the battlefield. If you do, until Vesuvan Shapeshifter is turned face down, it becomes a copy of that creature, except it has “At the beginning of your upkeep, you may turn this creature face down.”
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Timebender is turned face up, choose one —
• Remove two time counters from target permanent or suspended card.
• Put two time counters on target permanent with a time counter on it or suspended card.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Coral Trickster is turned face up, you may tap or untap target permanent.

Slipstream Serpent can’t attack unless defending player controls an Island.
When you control no Islands, sacrifice Slipstream Serpent.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

: Turn Mischievous Quanar face down.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Mischievous Quanar is turned face up, copy target instant or sorcery spell. You may choose new targets for that copy.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
Whenever another nontoken creature you control dies, draw a card.

Creatures you control get +0/+1.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Morph—Reveal a blue card in your hand. (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Dragon’s Eye Savants is turned face up, look at target opponent’s hand.

Flying
: Fledgling Mawcor deals 1 damage to any target.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Flying
: Mistform Shrieker becomes the creature type of your choice until end of turn.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Shaper Parasite is turned face up, target creature gets +2/-2 or -2/+2 until end of turn.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

: Regenerate Kin-Tree Warden.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Morph—Return two Islands you control to their owner’s hand. (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Fathom Seer is turned face up, draw two cards.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)