Legion, Demon Horde

When this card enters the battlefield, take
control of target creature an opponent controls.
As long as you control that creature, this card
is an enchantment aura attached to that creature
with, "Enchanted creature gains +4/+4, trample,
and 'Whenever enchanted creature is destroyed,
create 5 3/3 demon tokens with haste. If an
opponent's devotion to white is greater than 7,
instead create 8 1/1 pig tokens with haste.'"
"We are called Legion, for we are many."