Drainer of the Canyons

When Drainer of the Canyons enters the
battlefield, if a player controls a Desert, put a
Trample counter on each creature you control.
Whenever a Desert enters the battlefield, create
a Treasure token and gain 1 life.
Sacrifice 5 Deserts: Create twenty 1/1 Black
Horror Spawn creature tokens with Flying.
They can't be blocked this turn.