Dark Triumph

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.

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

All creatures get -2/-2 until end of turn.

As an additional cost to cast this spell, sacrifice a creature.

Target creature gets -X/-X until end of turn, where X is the sacrificed creature's power.

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.

Destroy target nonblack creature. It can't be regenerated.

You may pay rather than pay this spell's mana cost if there are thirteen or more creatures on the battlefield.

Each player sacrifices thirteen creatures of their choice.

You may sacrifice a nontoken black creature rather than pay this spell's mana cost.

Each opponent sacrifices a creature or planeswalker with the greatest mana value among creatures and planeswalkers they control.