Yvaltas, Titan of War's Might

When Yvaltas enters the battlefield, sacrifice
unless it escaped.
Whenever Yvaltas enters the battlefield or attacks, Creatures you control get +X+X until end of
turn, where X is the number of creatures you
control, then each creature you control fights
target creature your opponent controls.
Escape—{w}{w}{r}{r}, Exile five other cards from
your graveyard.