Mountain

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Haste (This creature can attack and {T} as soon as it comes under your control.)
Other Goblin creatures you control get +1/+1 and have haste.

{R}: Goblin Balloon Brigade gains flying until end of turn.

Haste (This creature can attack and {T} as soon as it comes under your control.)

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

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

Goblin spells you cast cost {1} less to cast.
Goblins you control have haste.

When Goblin Arsonist dies, you may have it deal 1 damage to any target.

When Goblin Instigator enters, create a 1/1 red Goblin creature token.

{T}: Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.