Stunning Likeness

If Stunning Likeness would enter the battlefield,
you may sacrifice a legendary permanent you
control instead. If you do, put Stunning Likeness
onto the battlefield. If you don't, put it into its
owner's graveyard.
At the beginning of your upkeep, if you control
Stunning Likeness, Cosmo Kramer, and another
legendary permanent, you win the game.
"You just blew my mind." -- Kramer