Whenever a creature an opponent controls is dealt excess noncombat damage, amass Orcs X, where X is that excess damage. (Put X +1/+1 counters on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)

{7}{R}: Fall of Cair Andros deals 7 damage to target creature.

As an additional cost to cast this spell, sacrifice a Goblin.

Goblin Grenade deals 5 damage to any target.

Whenever you cast a noncreature spell, you may pay {1}. If you do, create a 1/1 red Goblin creature token with haste.

Kami's Flare deals 3 damage to target creature or planeswalker. Kami's Flare also deals 2 damage to that permanent's controller if you control a modified creature. (Equipment, Auras you control, and counters are modifications.)

Whenever Pashalik Mons or another Goblin you control dies, Pashalik Mons deals 1 damage to any target.

{3}{R}, Sacrifice a Goblin: Create two 1/1 red Goblin creature tokens.

Whenever a creature is dealt damage, Repercussion deals that much damage to that creature's controller.

Hideaway 4 (When this land enters the battlefield, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)

Spinerock Knoll enters the battlefield tapped.

{T}: Add {R}.

{R}, {T}: You may play the exiled card without paying its mana cost if an opponent was dealt 7 or more damage this turn.

Defender

{T}: Unruly Catapult deals 1 damage to each opponent.

Whenever you cast an instant or sorcery spell, untap Unruly Catapult.