Barren, Tectonic Devastator

Barren, Tectonic Devastator costs {1} less to cast
for each land in each of your opponent's
graveyards.
Whenever this creature attacks each opponent sacrifices a land. Whenever a land is put into a graveyard add {w}, {b}, or {r}.
{w}{b}{r} Discard a card: Barren, Tectonic
Devastator gets plainswalk, swampwalk, or mountainwalk until end of turn.
"To live is to feast nothing else matters."