Infinite Death

When this creature enters, untap up to seven lands.

Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.

When this creature enters, return target instant or sorcery card from your graveyard to your hand.

When this creature enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each in the mana costs of permanents you control counts toward your devotion to black.)

Search your library for up to three creature cards, put them into your graveyard, then shuffle.

Each player exiles all creature cards from their graveyard, then sacrifices all creatures they control, then puts all cards they exiled this way onto the battlefield.