Invoke Calamity

You may cast up to two instant and/or sorcery spells with total mana value 6 or less from your graveyard and/or hand without paying their mana costs. If those spells would be put into your graveyard, exile them instead. Exile Invoke Calamity.

Antagonize

Target creature gets +4/+3 until end of turn.

Shock

Tormenting Voice

As an additional cost to cast this spell, discard a card.
Draw two cards.

Staff of the Flame Magus

Whenever you cast a red spell or a Mountain you control enters, you gain 1 life.

Torch Courier

Haste
Sacrifice Torch Courier: Another target creature gains haste until end of turn.

Mountain

Accorder's Shield

Equipped creature gets +0/+3 and has vigilance. (Attacking doesn't cause it to tap.)
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

Armillary Sphere

{2}, {T}, Sacrifice Armillary Sphere: Search your library for up to two basic land cards, reveal them, put them into your hand, then shuffle.

Epiphany Storm

Enchant creature
Enchanted creature has "{R}, {T}, Discard a card: Draw a card."

Zada, Hedron Grinder

Whenever you cast an instant or sorcery spell that targets only Zada, Hedron Grinder, copy that spell for each other creature you control that the spell could target. Each copy targets a different one of those creatures.

Rummaging Goblin

Springleaf Drum

{T}, Tap an untapped creature you control: Add one mana of any color.

Fiery Impulse

Fiery Impulse deals 2 damage to target creature.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, Fiery Impulse deals 3 damage instead.

Goblin Instigator

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

Goblin Boom Keg

At the beginning of your upkeep, sacrifice Goblin Boom Keg.
When Goblin Boom Keg is put into a graveyard from the battlefield, it deals 3 damage to any target.

Imposing Visage

Enchant creature
Enchanted creature has menace. (It can't be blocked except by two or more creatures.)

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Boggart Brute

Menace (This creature can't be blocked except by two or more creatures.)

Burning Anger

Enchant creature
Enchanted creature has "{T}: This creature deals damage equal to its power to any target."

Hearthfire Hobgoblin

Cartouche of Zeal

Enchant creature you control
When Cartouche of Zeal enters, target creature can't block this turn.
Enchanted creature gets +1/+1 and has haste. (It can attack and {T} no matter when it came under your control.)

Howl of the Horde

When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
Raid — If you attacked this turn, when you next cast an instant or sorcery spell this turn, copy that spell an additional time. You may choose new targets for the copy.

Battle-Rattle Shaman

At the beginning of combat on your turn, you may have target creature get +2/+0 until end of turn.

Dragon Fodder

Create two 1/1 red Goblin creature tokens.

Goblin Warchief

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

Furious

Furious deals 3 damage to each creature without flying.

Fast

Fast // Furious

Goblin Barrage

Kicker—Sacrifice an artifact or Goblin. (You may sacrifice an artifact or Goblin in addition to any other costs as you cast this spell.)
Goblin Barrage deals 4 damage to target creature. If this spell was kicked, it also deals 4 damage to target player or planeswalker.

Searing Spear

Searing Spear deals 3 damage to any target.

Mogg Fanatic

Sacrifice Mogg Fanatic: It deals 1 damage to any target.

Volley Veteran

When this creature enters, it deals damage to target creature an opponent controls equal to the number of Goblins you control.

Lightning Strike

Lightning Strike deals 3 damage to any target.

Rakdos Locket

{T}: Add {B} or {R}.
{B/R}{B/R}{B/R}{B/R}, {T}, Sacrifice Rakdos Locket: Draw two cards.

Tok-Tok, Volcano Born

Protection from red
If a red source would deal damage to a player, it deals that much damage plus 1 to that player instead.