Stir Up Trouble

As an additional cost to cast this spell, sacrifice an artifact or creature or pay {4}.
Destroy target creature.

Stony-Voiced Goblins

When this creature enters, each opponent discards a card.

Supper for Spiders

Put onto the battlefield under your control all creature cards in your opponents' graveyards that were put there from the battlefield this turn. They are Food artifacts with "{2}, {T}, Sacrifice this artifact: You gain 3 life." (They lose all other types and subtypes.)

Balin, Loremaster

Storied (If you control three or more artifacts, legendaries, and/or Sagas, you have an enduring story for the rest of the game.)
Whenever Balin or another Dwarf you control enters, you may discard your hand. Draw X cards, where X is the number of cards discarded this way. If you have an enduring story, Balin deals X damage to each opponent.

Bombur, Gentle Dreamer

Storied (If you control three or more artifacts, legendaries, and/or Sagas, you have an enduring story for the rest of the game.)
Bombur doesn't untap during your untap step unless you have an enduring story.

Goblin Army

Bothersome Noisemaker

Whenever you cast a noncreature spell, amass Goblins 1. (Put a +1/+1 counter on an Army you control. It's also a Goblin. If you don't control an Army, create a 0/0 black Goblin Army creature token first.)

Dwarven Provisioner

{3}{W}: Creatures you control get +1/+1 until end of turn.

Burn, Burn, Tree and Fern

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
I — This Saga deals 6 damage to target creature an opponent controls.
II — Destroy target artifact an opponent controls.
III, IV — Add {R}.

Dáin Ironfoot

When Dáin enters, create a colorless Equipment artifact token named Axe with "Equipped creature gets +1/+0" and equip {2}. When you do, attach it to target creature you control.
Whenever Dáin attacks, each equipped attacking creature gains double strike until end of turn.

Desert Were-Worm

This creature gets +2/+0 for each Mountain you control.
Whenever you attack with creatures with total power 12 or greater for the first time each turn, untap all attacking creatures. After this phase, there is an additional combat phase.

Desolation of Smaug

Desolation of Smaug deals 3 damage to each non-Dragon creature.
Add four mana in any combination of colors. Spend this mana only to cast Dragon spells.

Treasure

Dori, Bearer of Friends

Trample
When Dori enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Dwarven Mauler

Equip abilities you activate that target this creature cost {2} less to activate.

Gandalf, Goblins' Bane

Whenever you cast a noncreature spell, Gandalf gets +1/+1 until end of turn and deals 1 damage to each opponent.

Flameshape

Look at the top two cards of your library and exile them face down. For as long as they remain exiled, you may play them if you control a Wizard.

Gandalf, Goblins' Bane // Flameshape

Gandalf, Spark Starter

Reach
When Gandalf enters, he deals 3 damage divided as you choose among one, two, or three targets.

Getaway Barrel

When this artifact is put into a graveyard from the battlefield, reveal the top thirteen cards of your library. Put a random creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

The Hobbit