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

Add {R} for each Goblin on the battlefield.

Indestructible (Effects that say "destroy" don't destroy this artifact.) {T}: Add one mana of any color.

Red creatures get +1/+1. Whenever a Mountain is tapped for mana, its controller adds an additional {R}.

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

{T}: You may put a Goblin permanent card from your hand onto the battlefield. {R}: Target Goblin gains protection from white until end of turn.

+1: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land. −2: Add {R} for each Mountain you control. −5: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to any target.'"

Sacrifice an artifact: Add {C}{C}.

{T}, Sacrifice an artifact: Add {R}{R}.

Whenever a creature enters, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it.

Lightning Bolt deals 3 damage to any target.

Create two 1/1 red Goblin creature tokens.

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