Equipped creature has lifelink.
Whenever equipped creature dies, return that card to the battlefield under its owner's control at the beginning of the next end step.
Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)
Resurrection Orb’s triggered ability creates a delayed triggered ability that will trigger at the beginning of the next end step. It triggers even if Resurrection Orb is no longer on the battlefield at that time.