Vendrel, the Finality

X: Put a loyalty counter on Vendrel, the Finality for every land your opponents have bought from the purchase zone.
-5: Destroy 2 lands from the purchase zone, create a X/X black Skeleton creature token with fear where X is the total price of the lands destroyed.
-20: Destroy each land your opponents have bought from the purchase zone. Each opponent loses life equal to the total price of the lands destroyed.