Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.

Mountain

Wheel of Fortune

Each player discards their hand, then draws seven cards.

Goblin Grenade

As an additional cost to cast this spell, sacrifice a Goblin.
Goblin Grenade deals 5 damage to any target.

Nevinyrral's Disk

This artifact enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Goblin King

Other Goblins get +1/+1 and have mountainwalk.

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.

Shatterstorm

Destroy all artifacts. They can't be regenerated.

Strip Mine

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

Goblin Balloon Brigade

{R}: This creature gains flying until end of turn.

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 this creature.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Fork

Copy target instant or sorcery spell, except that the copy is red. You may choose new targets for the copy.

Mishra's Factory

{T}: Add {C}.
{1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Goblin Hero

Winds of Change

Each player shuffles the cards from their hand into their library, then draws that many cards.