Surtur's Eternal Flame

{x}{r}, {t}: Return target creature card with
converted mana cost X or less from your
graveyard to your hand.
{6}{r}: Eternal Flame becomes an Aura. Enchant
target creature. Eternal Flame becomes an artifact
again if it's not attached to a creature.
Enchanted creature gets +4/+4 and has menace.
If Eternal Flame would be put into a graveyard
from anywhere, reveal Eternal Flame and shuffle
it into its owner's library instead.