Number 39: Utopia

Xyz Overlay —You may cast this spell without paying its mana cost by stacking it on top of two other creatures under your control with mana value 4. Creatures under it phases out. (They are treated as overlayed while under it.)

Vigilance, Reach

{t}: Remove attacking creature from combat and untap it. Send one overlayed creature to the graveyard, if you can't, sacrifice Number 39: Utopia.

Entrust your dreams to its white wings of light!