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.

Castle Embereth

Castle Embereth enters tapped unless you control a Mountain.
{T}: Add {R}.
{1}{R}{R}, {T}: Creatures you control get +1/+0 until end of turn.

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

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

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

Create two 1/1 red Goblin creature tokens.

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

Lightning Bolt deals 3 damage to any target.

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

Choose one —
• Charge Them — Creatures you control get +2/+0 until end of turn.
• Befriend Them — Create two 1/1 red Goblin creature tokens.