Goblin Warchief

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

Dockside Extortionist

When Dockside Extortionist enters, create X Treasure tokens, where X is the number of artifacts and enchantments your opponents control. (Treasure tokens are artifacts with "{T}, Sacrifice this artifact: Add one mana of any color.")

Beetleback Chief

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

Rundvelt Hordemaster

Other Goblins you control get +1/+1.
Whenever Rundvelt Hordemaster or another Goblin you control dies, exile the top card of your library. If it's a Goblin creature card, you may cast that card until the end of your next turn.

Goblin Assault

At the beginning of your upkeep, create a 1/1 red Goblin creature token with haste.
Goblin creatures attack each combat if able.

Crazed Goblin

Crazed Goblin attacks each combat if able.

Ember Hauler

{1}, Sacrifice Ember Hauler: It deals 2 damage to any target.

Mountain

Volcanic Hammer

Volcanic Hammer deals 3 damage to any target.

Goblin Bombardment

Sacrifice a creature: Goblin Bombardment deals 1 damage to any target.

Fanatical Firebrand

Haste (This creature can attack and {T} as soon as it comes under your control.)
{T}, Sacrifice this creature: It deals 1 damage to any target.