If Wings of Hubris becomes attached to a creature you don't control, you can activate the ability to make that creature unblockable, but you won't be able to sacrifice the creature at the beginning of the next end step.
2020-01-24
If you gain control of a creature "until end of turn," you control it during your end step. If you use Wings of Hubris to make this creature fly too close to the sun, you'll sacrifice it.
Equipped creature has flying.
Sacrifice this Equipment: Equipped creature can't be blocked this turn. Sacrifice it at the beginning of the next end step.
Equip (: Attach to target creature you control. Equip only as a sorcery.)
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