Whitesnake

Stand (Must be attached to another creature, designated as it's user. Can attack Instead of
the user, but both get full combat damage.
if either one of them die, sacrifice the other.)
{5},{t}: Detach target stand from it's user.
It's user stays alive and the stand returns to
Whitesnake's owner's hand. The stand returns
to it's original owner's hand if Whitesnake dies.