Immolation

Enchant creature
Enchanted creature gets +2/-2.

Flying Carpet

{2}, {T}: Target creature gains flying until end of turn.

Goblin Caves

Enchant land
As long as enchanted land is a basic Mountain, Goblin creatures get +0/+2.

Gravity Sphere

Fire Drake

Flying
{R}: Fire Drake gets +1/+0 until end of turn. Activate only once each turn.

Sol Ring

Pyrotechnics

Pyrotechnics deals 4 damage divided as you choose among any number of targets.

Goblins of the Flarg

Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.)
When you control a Dwarf, sacrifice Goblins of the Flarg.

Mountain

Goblin Shrine

Enchant land
As long as enchanted land is a basic Mountain, Goblin creatures get +1/+0.
When Goblin Shrine leaves the battlefield, it deals 1 damage to each Goblin creature.

Goblin Hero

Book of Rass

Fissure

Destroy target creature or land. It can't be regenerated.

Eternal Flame

Eternal Flame deals X damage to target opponent or planeswalker and half X damage, rounded up, to you, where X is the number of Mountains you control.

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.

Inferno

Inferno deals 6 damage to each creature and each player.

Strip Mine

{T}: Add {C}.
{T}, Sacrifice Strip Mine: Destroy target land.

Mana Clash

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up heads on the same flip.

Goblin Rock Sled

Trample
Goblin Rock Sled doesn't untap during your untap step if it attacked during your last turn.
Goblin Rock Sled can't attack unless defending player controls a Mountain.

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice this creature.