Tastrin, The Inferno

This spell costs {1} less to cast for each mountain
you control.
Indestructible, Haste, Mountainfall(Whenever a mountain enters the battlefield inter your control
you may deal 3 damage to any target.)
Whenever a spell or ability of a permanent you
control destroys a permanent an opponent
controls you may copy that spell or ability. You
may choose new targets for the copy.