Mass Necromancy

Flash, Hexproof, Indestructible
When Mass Necromancy enters the battlefield
exile all creatures under Mass Necromancy. At
the beggining of each upkeep, randomly choose
a card exiled under Mass Necromancy and
return it to the battlefield under its owners
control. If you don't own that creature it gets
base power and toughness 1/1.
{p/b}{p/b}{p/b}{p/b},Exile Mass Necromancy, You lose 7
life and then gain life equal to the amount of creatures exiled with Mass Necromancy.