Goblin Arsonist

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

Mountain

Thriving Bluff enters tapped. As it enters, choose a color other than red.
{T}: Add {R} or one mana of the chosen color.

Menace (This creature can't be blocked except by two or more creatures.)

When Beetleback Chief enters, create two 1/1 red Goblin creature tokens.

When this creature enters, it deals damage to target creature an opponent controls equal to the number of Goblins you control.

Whenever Ornery Goblin blocks or becomes blocked by a creature, Ornery Goblin deals 1 damage to that creature.

{1}, Sacrifice an artifact or creature: Makeshift Munitions deals 1 damage to any target.

When Goblin Shortcutter enters, target creature can't block this turn.

When Goblin Commando enters, it deals 2 damage to target creature.

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