Skyline Cascade enters the battlefield tapped.
When Skyline Cascade enters the battlefield, target creature an opponent controls doesn't untap during its controller's next untap step.
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The triggered ability tracks the creature, but not its controller. If the creature changes controllers before its first controllerâ€™s next untap step has come around, then it wonâ€™t untap during its new controllerâ€™s next untap step.
Skyline Cascadeâ€™s triggered ability doesnâ€™t tap the creature. It can target any creature, tapped or untapped. If that creature is already untapped at the beginning of its controllerâ€™s next untap step, the effect wonâ€™t do anything.