Magma Elemental

Magma Elementals power an thoughness are each
equal to the number of mountains under your
controll.
Whenever Magma Elemental is dealt damage by an
opponent creature, deal 3 damage to that creature.
{2}{r}, discard a card: cast a red sorcery card from
your hand without paying its mana cost. Trigger
this abillity only once each turn.