When you planeswalk to Pompeii and at the beginning of your upkeep, put an eruption counter on it. Whenever you roll a blank on the planar die, scry 2 (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.). Then put an eruption counter on Pompeii. When chaos ensues, Pompeii deals damage to each creature and each player equal to the number of eruption counters on Pompeii. Each player sacrifices a land. Then planeswalk.