Planequake deals X damage to each creature without flying and each planeswalker. If X is 10 or more, open the "Uncovered Cavern" plot booster.
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12 Nov 2019
Creatures and planeswalkers dealt lethal damage by Planequake won’t be destroyed until state-based actions are performed, after you’ve opened the “Uncovered Cavern” plot booster if applicable.
12 Nov 2019
If you don’t have the appropriate unopened plot booster when instructed to open one, that part of the spell or ability’s effect is ignored.