Cinder Elemental

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

Magmaquake

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

Volcanic Geyser deals X damage to any target.

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

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

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

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

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

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

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

Bloodrock Cyclops attacks each combat if able.

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

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