Corpse Seed Metamorph

MindDelve 6 (You may discard a card 6 cards and
draw 5 card to reduce the mana cot of this spell by
{6}.)
When Corpse Seed Metamorph enters the
battlefield, exile a creature card from a graveyard
it becomes a copy of that creature. Except it
retains " if this creature would die, exile it, you
may pay {3}{u}{u} to return it to play.
"Every time it is slain, it's spirit is freed to move into
a new corpse and grew a fresh body from it."