Mountain

Wall of Fire

Defender (This creature can't attack.)
{R}: This creature gets +1/+0 until end of turn.

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.

Detonate

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

Shivan Dragon

Flying
{R}: This creature gets +1/+0 until end of turn.

The Hive

{5}, {T}: Create a 1/1 colorless Insect artifact creature token with flying named Wasp. (It can't be blocked except by creatures with flying or reach.)

Power Surge

At the beginning of each player's upkeep, this enchantment deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn.

Onulet

When this creature dies, you gain 2 life.

Soul Net

Whenever a creature dies, you may pay {1}. If you do, you gain 1 life.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Mana Flare

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Inferno

Inferno deals 6 damage to each creature and each player.

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.