When Themberchaud enters the battlefield, he deals X damage to each other creature without flying and each player, where X is the number of Mountains you control.
You may exert Themberchaud as he attacks. When you do, he gains flying until end of turn. (An exerted creature won’t untap during your next untap step.)
![Themberchaud [Secret Lair: Universes Within]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/Themberchaud.png?v=1752476098&width=1445)