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When you planeswalk to Ketria and at the beginning of your upkeep, put your choice of a vigilance, menace, or trample counter on target creature you control.
Whenever chaos ensues, exile cards from the top of your library until you exile a nonland permanent card. Put that card onto the battlefield or into your hand.
While resolving the chaos ability, the cards you exile before exiling a nonland permanent card remain exiled.
You choose which counter you’re putting on the target creature as Ketria’s first ability resolves.