Whenever a player casts a black spell, you may pay . If you do, you gain 1 life.

+1: Untap two target lands.
−1: Create a 3/3 green Beast creature token.
−4: Creatures you control get +3/+3 and gain trample until end of turn.

Other Goblins get +1/+1 and have mountainwalk.

Proliferate, then choose any number of permanents you control that had a counter put on them this way. Those permanents phase out. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there. Treat phased-out permanents and anything attached to them as though they don't exist until their controller's next turn.)

+1: You gain 2 life.
−1: Put a +1/+1 counter on each creature you control. Those creatures gain vigilance until end of turn.
−6: Create a white Avatar creature token. It has "This token's power and toughness are each equal to your life total."

Skulk (This creature can't be blocked by creatures with greater power.)
Whenever Gregor, Shrewd Magistrate deals combat damage to a player, draw cards equal to its power.

Whenever an opponent casts their first spell each turn, that player exiles the top card of their library. If it's a nonland card, you may cast it without paying its mana cost.

Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.

When this creature enters, return a red or green creature you control to its owner's hand.

Other artifact creatures you control get +1/+0.
: Create a token that's a copy of another target artifact you control. That token gains haste. Sacrifice it at the beginning of the next end step.

Whenever one or more other Elves you control enter, create a 1/1 green Elf Warrior creature token. This ability triggers only once each turn.
: Elves you control get +2/+2 and gain deathtouch until end of turn.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever this creature deals combat damage to a player, that player skips their next combat phase.

Attacking creatures you control get +1/+0.
At the beginning of each upkeep, if no spells were cast last turn, transform this creature.

This land enters tapped unless you control two or fewer other lands.
: Add or .

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip

: Add .
: Target nonland permanent becomes an artifact in addition to its other types until end of turn.

This spell costs less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

: Add one mana of any color. Spend this mana only to cast a creature spell.
: Until end of turn, target creature you control with power 4 or greater gains trample and "Whenever this creature deals combat damage to a player, draw a card."

First strike
Whenever Mirri attacks, each opponent can't block with more than one creature this combat.
As long as Mirri is tapped, no more than one creature can attack you each combat.

Whenever a creature you control is dealt damage, put a +1/+1 counter on it. (It must survive the damage to get the counter.)