Have

Goblin Goon

This creature can't attack unless you control more creatures than defending player.
This creature can't block unless you control more creatures than attacking player.

Shock

Goblin Oriflamme

Attacking creatures you control get +1/+0.

Goblin Arsonist

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

Goblin Commando

When this creature enters, it deals 2 damage to target creature.

Burn Bright

Creatures you control get +2/+0 until end of turn.

Goblin Instigator

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

Goblins

Muxus, Goblin Grandee

When Muxus enters, reveal the top six cards of your library. Put all Goblin creature cards with mana value 5 or less from among them onto the battlefield and the rest on the bottom of your library in a random order.
Whenever Muxus attacks, it gets +1/+1 until end of turn for each other Goblin you control.

Boggart Brute

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

Goblin Lore

Draw four cards, then discard three cards at random.

Outnumber

Outnumber deals damage to target creature equal to the number of creatures you control.

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.

Thriving Bluff

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

Volley Veteran

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

Krenko, Mob Boss

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

Battle-Rattle Shaman

At the beginning of combat on your turn, you may have target creature get +2/+0 until end of turn.

Mountain

Barrage of Expendables

{R}, Sacrifice a creature: This enchantment deals 1 damage to any target.

Goblin Shortcutter

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

Ornery Goblin

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

Makeshift Munitions

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