Number 39, Utopia

Overlay 2 (You may only cast this spell by exiling 2 permanents you control that have the same mana value as this card instead of paying this card's mana cost. This spell enters with 2 XYZ counters on it.)
Remove an XYZ counter from Number 39, Utopia: Remove target attacking creature from combat.

If Number 39, Utopia would take combat damage while it has no XYZ counters, sacrifice it.