The swarm's million wings stir the foulest of breezes.

Death Cloud

Each player loses X life, discards X cards, sacrifices X creatures of their choice, then sacrifices X lands of their choice.

The List

Modern Masters

Each player loses X life, discards X cards, sacrifices X creatures, then sacrifices X lands.

Darksteel

Each player loses X life, then discards X cards from his or her hand, then sacrifices X creatures, then sacrifices X lands.

If you control a permanent that’s a creature and a land, and you choose to sacrifice it as you sacrifice creatures, it won’t be on the battlefield when you sacrifice lands. You can’t sacrifice it again.