Massacre

If an opponent controls a Forest and you control a Swamp, you may cast this spell without paying its mana cost.

: This creature gets +1/+1 until end of turn.

All creatures get -3/-3 until end of turn.

You may cast a spell with mana value 3 or less from your hand without paying its mana cost.

Mayhem (You may cast this card from your graveyard for if you discarded it this turn. Timing rules still apply.)

All creatures get -2/-2 until end of turn. If this spell's mayhem cost was paid, creatures your opponents control get -2/-2 until end of turn instead.

If you control a commander, you may cast this spell without paying its mana cost.

Exile target creature.

If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost.

Creatures you control get +2/+0 until end of turn.

You may discard a Swamp card rather than pay this spell's mana cost.

Choose a creature type. All creatures of that type get -1/-1 until end of turn.