Keyword: Morph

Whenever Thrashing Mudspawn is dealt damage, you lose 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.)

Trample, haste
At the beginning of the end step, sacrifice Blistering Firecat.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Trample
Whenever Hystrodon deals combat damage to a player, you may draw 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.)

, Sacrifice a Wizard: Counter target spell.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Nameless One’s power and toughness are each equal to the number of Wizards on the battlefield.
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 Skirk Commando deals combat damage to a player, you may have it deal 2 damage to target creature that player controls.
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 Snapping Thragg deals combat damage to a player, you may have it deal 3 damage to target creature that player controls.
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 Cabal Executioner deals combat damage to a player, that player sacrifices a creature.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Reach (This creature can block creatures with 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 (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.)

Whenever Broodhatch Nantuko is dealt damage, you may create that many 1/1 green Insect creature tokens.
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 Haunted Cadaver deals combat damage to a player, you may sacrifice it. If you do, that player discards three 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.)

Whenever Dawning Purist deals combat damage to a player, you may destroy target enchantment that player controls.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

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

Tap two untapped Elves you control: Add one mana of any color.
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 Riptide Entrancer deals combat damage to a player, you may sacrifice it. If you do, gain control of target creature that player controls. (This effect lasts indefinitely.)
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

: Prevent the next 1 damage that would be dealt to any target this 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.)

Whenever Ebonblade Reaper attacks, you lose half your life, rounded up.
Whenever Ebonblade Reaper deals combat damage to a player, that player loses half their life, rounded up.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

At the beginning of your upkeep, flip a coin. If you lose the flip, turn Skittish Valesk 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.)

: Target Beast creature gets +1/+1 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.)

Protection from Clerics
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
: If target spell has only one target and that target is Quicksilver Dragon, change that spell’s target to another creature.
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.)

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