Cinder Elemental

{X}{R}, {T}, Sacrifice Cinder Elemental: It deals X damage to any target.

Spitting Earth

Spitting Earth deals damage to target creature equal to the number of Mountains you control.

Whenever Ashmouth Hound blocks or becomes blocked by a creature, Ashmouth Hound deals 1 damage to that creature.

Volcanic Geyser deals X damage to any target.

{R}, {T}, Exile two cards from your graveyard: Grim Lavamancer deals 2 damage to any target.

When Mana Geode enters, scry 1.
{T}: Add one mana of any color.

{R}: Molten Ravager gets +1/+0 until end of turn.

Magmaquake deals X damage to each creature without flying and each planeswalker.

When Seismic Elemental enters, creatures without flying can't block this turn.

Magma Jet deals 2 damage to any target. Scry 2.

This spell can't be countered.
Volcanic Fallout deals 2 damage to each creature and each player.

Bloodrock Cyclops attacks each combat if able.

Thriving Bluff enters tapped. As it enters, choose a color other than red.
{T}: Add {R} or one mana of the chosen color.