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However, effects that stop a creature from untapping "during your untap step" or "during its controller's untap step" won't stop that creature from untapping during another player's untap step, and as such, Prop Room's ability will cause that creature to untap

So good luck if you are hoping to pull one

As for Shalai and Hallar, it only interacts with +1/+1 counters

Finale of Devastation lets you search your library for a creature with a mana value equal to X, where X is the amount of mana you put into the spells cost, and put it directly into play

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