Dyson Sphere, XYZ 9

XYZ Overlay

If an opponent controls a creature with higher power than
this card, you can remove an XYZ counter from an
exiled card: Dyson Sphere, XYZ 9 has Flying this turn.
Only activate this effect as a sorcery.

If you block with Dyson Sphere, XYZ 9 and there aren't
exiled card with XYZ counters on them: exile 2
creatures in your graveyard and put XYZ counters on
them.