Pyroclasm

Pyroclasm deals 2 damage to each creature.

Manic Vandal

When Manic Vandal enters, destroy target artifact.

Prodigal Pyromancer

{T}: Prodigal Pyromancer deals 1 damage to any target.

Demolish

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Hellkite Charger

Flying, haste
Whenever Hellkite Charger attacks, you may pay {5}{R}{R}. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.

Quest for Pure Flame

Whenever a source you control deals damage to an opponent, you may put a quest counter on Quest for Pure Flame.
Remove four quest counters from Quest for Pure Flame and sacrifice it: If any source you control would deal damage to a permanent or player this turn, it deals double that damage to that permanent or player instead.

Lava Axe

Lava Axe deals 5 damage to target player or planeswalker.

Vulshok Heartstoker

When Vulshok Heartstoker enters, target creature gets +2/+0 until end of turn.

Plated Geopede

First strike
Landfall — Whenever a land you control enters, Plated Geopede gets +2/+2 until end of turn.

Melt Terrain

Destroy target land. Melt Terrain deals 2 damage to that land's controller.

Thunder Strike

Target creature gets +2/+0 and gains first strike until end of turn. (It deals combat damage before creatures without first strike.)

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Oxidda Scrapmelter

When Oxidda Scrapmelter enters, destroy target artifact.

Mountain

Mark of Mutiny

Gain control of target creature until end of turn. Put a +1/+1 counter on it and untap it. That creature gains haste until end of turn. (It can attack and {T} this turn.)

Shatter

Volcanic Strength

Enchant creature
Enchanted creature gets +2/+2 and has mountainwalk. (It can't be blocked as long as defending player controls a Mountain.)

Unstable Footing

Kicker {3}{R} (You may pay an additional {3}{R} as you cast this spell.)
Damage can't be prevented this turn. If this spell was kicked, it deals 5 damage to target player or planeswalker.