Roilborn Inferno

Surge-{2}{r}{r}{r}
{4}: Roilborn Inferno deals X damage to target creature, where X is the number of mountains you control.
{3}: Roilborn Inferno deals damage to target creature equal to all the cards named Roilborn Inferno on the battlefield or in a graveyard. If that creature dies, exile it unless it's controllers pays mana equal to its converted mana cost.