I couldn't find the answer to this but what happens if you have a face down morph on the field and someone plays Ixidron? Does my morph creature stay face down or do they get turned up?
1 Answer
The text printed on the Ixidron reads as follows:
As Ixidron enters the battlefield, turn all other nontoken creatures face down. (They're 2/2 creatures.) Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.
As morphed creatures are already face-down they are unaffected.
This is reflected in the Ruling made in 2006:
2006-09-25 : Turning a face-down creature face-down typically has no effect; the creature’s status is unchanged.
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3Basically, it's like asking you to tap all creatures, and you control a tapped creature. Nothing happens to it. Also, it is considered good form to quote official sources that directly address the issue at hand. Like the Gatherer page you linked: "Turning a face-down creature face-down typically has no effect; the creature’s status is unchanged."– ArthurJul 17, 2019 at 8:04