Whenever a creature you control mutates, put a +1/+1 counter on that creature and you gain 2 life.

Flash
Adaptive Shimmerer enters the battlefield with three +1/+1 counters on it.

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature or Vehicle
When Aether Meltdown enters the battlefield, you get (two energy counters).
Enchanted permanent gets -4/-0.

Each player sacrifices all colored permanents they control.

Defender
: Amaranthine Wall gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Whenever you crank Applied Aeronautics, until end of turn, target creature gets +1/+0, gains flying, and becomes an artifact in addition to its other types.

If an opponent searched their library this turn, you may pay rather than pay this spell's mana cost.
Target opponent mills thirteen cards.

Reach, trample

When you cast this spell, you may return target creature card from your graveyard to the battlefield.
Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents.)

Whenever you crank Auto-Key, until end of turn, target creature becomes an artifact in addition to its other types and gains ": You gain 3 life."

: Add .
, , Sacrifice Blighted Fen: Target opponent sacrifices a creature.

: Add .
, , Sacrifice Blighted Woodland: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle your library.

Equipped creature gets +3/+0.
As long as equipped creature is a Human, it has lifelink.
Equip

Assist (Another player can pay up to of this spell's cost.)
Trample

Haste
Menace (This creature can't be blocked except by two or more creatures.)
When Chittering Host enters the battlefield, other creatures you control get +1/+0 and gain menace until end of turn.

: Add one mana of any color.
: Put a charge counter on Coalition Relic.
At the beginning of your precombat main phase, remove all charge counters from Coalition Relic. Add one mana of any color for each charge counter removed this way.

: Target player mills a card. (They put the top card of their library into their graveyard.)
, , Sacrifice Codex Shredder: Return target card from your graveyard to your hand.

At the beginning of your end step, you may exile target creature you control, then return that card to the battlefield under your control.

When Corridor Monitor enters the battlefield, untap target artifact or creature you control.