Numeron Gate Exum, XYZ N1

XYZ Overlay 3 - (As an additional cost to play this card, exile 3 or more nonland permanents you control with mana value equal to this card's and give them XYZ counters. Protection from nonlegendary.)

Indestructible

If Numeron Gate Exum, XYZ N1 attacked or blocked, at the end of combat you may {t}, remove 1 XYZ counter from a banished card: double the power of constructs you control until the end of the turn.