Reunion of the Dead

Suspend 3—{2}{b}{b} (Rather than cast this card
from your hand, pay {2}{b}{b} and exile it with
three time counters on it. At the beginning of
your upkeep, remove a time counter. When the
last is removed, cast it without paying its mana
cost.)
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.