Daring Terramorph

Target non-Basic land becomes a basic land
type of your choice until end of turn.
At the start of your next turn, destroy that land
and Daring Terramorph inflicts {x}damage equal
the number of basic lands, the kind you have
previously chosen, that are in play, to target player.
Planeswalker Gothmog tried to explore Oak
Island underground by subverting the money pit structure to stabilize it, but in the end the fragile tunnels collapsed igniting the islands doom.