Goblin Wardriver

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Skirk Prospector

Double strike
Whenever Warren Instigator deals damage to an opponent, you may put a Goblin creature card from your hand onto the battlefield.

Sacrifice a Goblin: Target creature gets +1/+1 until end of turn.

Whenever Goblin Lackey deals damage to a player, you may put a Goblin permanent card from your hand onto the battlefield.

Whenever another red creature you control enters, Foundry Street Denizen gets +1/+0 until end of turn.

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

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.

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