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.)

Whenever another permanent enters the battlefield under your control, each opponent mills a card.

Whenever Arashin War Beast deals combat damage to one or more blocking creatures, manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Arc Lightning deals 3 damage divided as you choose among one, two, or three targets.

Briber's Purse enters the battlefield with X gem counters on it.
, , Remove a gem counter from Briber's Purse: Target creature can't attack or block this turn.

Enchant creature
Enchanted creature gets -2/-2.

Put two +1/+1 counters on target creature and untap it.

Manifest the top card of your library, then put two +1/+1 counters on it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Manifest the top card of your library, then put a +1/+1 counter on it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Equipped creature gets +2/+2.
Equip
Ghostfire Blade's equip ability costs less to activate if it targets a colorless 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.)
Whenever another nontoken creature you control dies, draw a card.

Cast this spell only if you've cast another spell 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.)
When Jeering Instigator is turned face up, if it's your turn, gain control of another target creature until end of turn. Untap that creature. It gains haste until end of turn.

Jeskai Infiltrator can't be blocked as long as you control no other creatures.
When Jeskai Infiltrator deals combat damage to a player, exile it and the top card of your library in a face-down pile, shuffle that pile, then manifest those cards. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Whenever a permanent you control is turned face up, you gain 1 life for each creature you control.
: Manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Mystic of the Hidden Way can't be blocked.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Exile target creature. Its controller manifests the top card of their library. (That player puts the top card of their library onto the battlefield face down as a 2/2 creature. If it's a creature card, it can be turned face up any time for its mana cost.)

Deathtouch
Morph—Reveal a black 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 Ruthless Ripper is turned face up, target player loses 2 life.

Destroy target creature with power 4 or greater.

Manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)