Goblin Grenade

As an additional cost to cast this spell, sacrifice a Goblin.
Goblin Grenade deals 5 damage to any target.

Foundry Street Denizen

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

Haste
Whenever Goblin Javelineer becomes blocked, it deals 1 damage to target creature blocking it.

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

Create two 1/1 red Goblin creature tokens.

Whenever a creature you control enters, Impact Tremors deals 1 damage to each opponent.

Create three 1/1 red Goblin creature tokens.

Add {R} for each Goblin on the battlefield.

Goblin War Strike deals damage to target player or planeswalker equal to the number of Goblins you control.