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. 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.

Planechase (Oversized)