Goblin King

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

Goblin Instigator

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

Lightning Bolt deals 3 damage to any target.

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

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

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.

When Goblin Matron enters, you may search your library for a Goblin card, reveal that card, put it into your hand, then shuffle.

Create two 1/1 red Goblin creature tokens.

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