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Rulings
If Endless Horizons leaves the battlefield, the remaining Plains cards stay exiled. If Endless Horizons returns to the battlefield, it’s a new object with no relation to its previous existence. The previously exiled Plains cards will still stay exiled.
If a different player gains control of Endless Horizons, its ability will trigger at the beginning of that player’s upkeep, but it won’t do anything when it resolves.
If a different player gains control of Endless Horizons, its ability will trigger at the beginning of that player’s upkeep, but it won’t do anything when it resolves.
Rulings
If Endless Horizons leaves the battlefield, the remaining Plains cards stay exiled. If Endless Horizons returns to the battlefield, it’s a new object with no relation to its previous existence. The previously exiled Plains cards will still stay exiled.
If a different player gains control of Endless Horizons, its ability will trigger at the beginning of that player’s upkeep, but it won’t do anything when it resolves.
If a different player gains control of Endless Horizons, its ability will trigger at the beginning of that player’s upkeep, but it won’t do anything when it resolves.
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