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Untap target creature an opponent controls and gain control of it until end of turn. That creature gains haste until end of turn. When you lose control of the creature, tap it.
You tap the creature when you lose control of it for any reason — because Ray of Command’s effect ends, or because a spell or ability causes another player to gain control of it.
The creature returns to the opponent when the “until end of turn” effect wears off during the cleanup step. It taps during the Cleanup step (if it is not already tapped), so any abilities triggered off it tapping happen at that time.
You may target an untapped creature with Ray of Command.
