Fall of Grosstol

Destroy target land. If the targeted land was a
nonbasic land, then destroy all nonbasic lands
your opponents control.
Create a 2/3 Nightmare Knight creature token
with menace for each land destroyed this way.
"King Parancs has unwisely left. Now, at long last,
it is time to show him the error of his ways. Burn the
city! Kill! Them! All!"