Planequake is a rare Sorcery card from Mystery Booster Playtest Cards 2019 (CMB1), collector number 59. Current market price: $17.26, TCGplayer market prices via Scryfall.
Planequake deals X damage to each creature without flying and each planeswalker. If X is 10 or more, open the "Uncovered Cavern" plot booster.