Whenever a creature dies, if it had a -1/-1 counter on it, put a -1/-1 counter on target creature.

Trample
Other red creatures you control get +1/+1.
Other green creatures you control get +1/+1.

Plainswalk (This creature can't be blocked as long as defending player controls a Plains.)
, Sacrifice Boggart Arsonists: Destroy target Scarecrow or Plains.

Haste
Wither (This deals damage to creatures in the form of -1/-1 counters.)

If you would gain life, you gain twice that much life instead.

Flying
Briarberry Cohort gets +1/+1 as long as you control another blue creature.

Burn Trail deals 3 damage to any target.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)

: Choose any number of target creatures. Each of those creatures gains persist until end of turn. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Whenever a creature dies, you may pay . If you do, Cemetery Puca becomes a copy of that creature, except it has this ability.

Target creature becomes blue until end of turn. Untap that creature.
Draw a card.

Chainbreaker enters the battlefield with two -1/-1 counters on it.
, : Remove a -1/-1 counter from target creature.

Wither (This deals damage to creatures in the form of -1/-1 counters.)
: Regenerate Cinderbones.

: Target player discards a card. Activate this ability only during your turn.
Put a -1/-1 counter on Cinderhaze Wretch: Untap Cinderhaze Wretch.

Return target permanent to its owner's hand. If that permanent is red or green, put it on top of its owner's library instead.

Black creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

Counter target spell. Search its controller's graveyard, hand, and library for all cards with the same name as that spell and exile them. Then that player shuffles their library.

Crabapple Cohort gets +1/+1 as long as you control another green creature.

When Cragganwick Cremator enters the battlefield, discard a card at random. If you discard a creature card this way, Cragganwick Cremator deals damage equal to that card's power to target player or planeswalker.

Target creature becomes red and gains haste until end of turn.
Draw a card.