Goblin Warchief

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

Krenko, Mob Boss

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

Goblin Trashmaster

Other Goblins you control get +1/+1.
Sacrifice a Goblin: Destroy target artifact.

Goblin Fireslinger

{T}: This creature deals 1 damage to target player or planeswalker.

Goblin King

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

Goblin Wizardry

Create two 1/1 red Goblin Wizard creature tokens with prowess. (Whenever you cast a noncreature spell, they get +1/+1 until end of turn.)

Mountain

Goblin Arsonist

When this creature dies, you may have it deal 1 damage to any target.

Frenzied Goblin

Whenever this creature attacks, you may pay {R}. If you do, target creature can't block this turn.

Goblin Vandal

Whenever this creature attacks and isn't blocked, you may pay {R}. If you do, destroy target artifact defending player controls and this creature assigns no combat damage this turn.

Coat of Arms

Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it. (For example, if two Goblin Warriors and a Goblin Shaman are on the battlefield, each gets +2/+2.)

Goblin Chieftain

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.

Raging Goblin

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