Fireblast

You may sacrifice two Mountains rather than pay this spell's mana cost.
Fireblast deals 4 damage to any target.

Disintegrate

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Lightning Bolt deals 3 damage to any target.

As long as Kaervek's Torch is on the stack, spells that target it cost {2} more to cast.
Kaervek's Torch deals X damage to any target.

Firebolt deals 2 damage to any target.
Flashback {4}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Choose one —
• Counter target spell if it's blue.
• Destroy target permanent if it's blue.

Rolling Earthquake deals X damage to each creature without horsemanship and each player.

{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

Lava Spike deals 3 damage to target player or planeswalker.