Death's Unending March

At the beginning of each players upkeep, that
player puts all creature cards from their graveyard
onto the battlefield. They gain haste until end of
turn. Sacrifice them at the beginning of the next
end step.
{1}{b}{b}: Pay 3 life: Each player puts the top three
cards of their library into their graveyard.
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The dead always outnumber the living.