Goblin Warchief

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

Guttersnipe

Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent.

Unleash Fury

Double the power of target creature until end of turn.

Titan's Strength

Target creature gets +3/+1 until end of turn. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Skirk Prospector

Goblin Gathering

Create a number of 1/1 red Goblin creature tokens equal to two plus the number of cards named Goblin Gathering in your graveyard.

Dualcaster Mage

Flash
When Dualcaster Mage enters, copy target instant or sorcery spell. You may choose new targets for the copy.

Leyline of Punishment

If Leyline of Punishment is in your opening hand, you may begin the game with it on the battlefield.
Players can't gain life.
Damage can't be prevented.

Krenko's Command

Create two 1/1 red Goblin creature tokens.

Battle Squadron

Flying
Battle Squadron's power and toughness are each equal to the number of creatures you control.

Claws of Valakut

Enchant creature
Enchanted creature gets +1/+0 for each Mountain you control and has first strike.

Ember Hauler

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

Mountain

Flame Slash

Flame Slash deals 4 damage to target creature.

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Bull Rush

Target creature gets +2/+0 until end of turn.

Krenko, Mob Boss

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

Battle Cry Goblin

{1}{R}: Goblins you control get +1/+0 and gain haste until end of turn.
Whenever Battle Cry Goblin attacks, if you attacked with creatures with total power 6 or greater this combat, create a 1/1 red Goblin creature token that's tapped and attacking.