Ruby Medallion

Red spells you cast cost {1} less to cast.

Dragonmaster Outcast

At the beginning of your upkeep, if you control six or more lands, create a 5/5 red Dragon creature token with flying.

Earthquake

Earthquake deals X damage to each creature without flying and each player.

Dragonspeaker Shaman

Dragon spells you cast cost {2} less to cast.

Hellkite Charger

Flying, haste
Whenever this creature attacks, you may pay {5}{R}{R}. If you do, untap all attacking creatures and after this phase, there is an additional combat phase.

Dragon's Claw

Whenever a player casts a red spell, you may gain 1 life.

Slavering Nulls

Whenever this creature deals combat damage to a player, if you control a Swamp, you may have that player discard a card.

Giant Scorpion

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Breath of Malfegor

Breath of Malfegor deals 5 damage to each opponent.

Burst Lightning

Kicker {4} (You may pay an additional {4} as you cast this spell.)
Burst Lightning deals 2 damage to any target. If this spell was kicked, it deals 4 damage instead.

Crucible of Fire

Volcanic Dragon

Rally the Forces

Attacking creatures get +1/+0 and gain first strike until end of turn.

Goblin Wardriver

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

Rorix Bladewing

Flameblast Dragon

Flying
Whenever this creature attacks, you may pay {X}{R}. If you do, it deals X damage to any target.

Mountain

Swamp

Gravedigger

When this creature enters, you may return target creature card from your graveyard to your hand.

Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Furyborn Hellkite

Bloodthirst 6 (If an opponent was dealt damage this turn, this creature enters with six +1/+1 counters on it.)
Flying

Pyroclasm

Pyroclasm deals 2 damage to each creature.

Disfigure

Target creature gets -2/-2 until end of turn.

Goblin Piker

Dragon Fodder

Create two 1/1 red Goblin creature tokens.

Festering Goblin

When this creature dies, target creature gets -1/-1 until end of turn.

Voracious Dragon

Flying
Devour 1 (As this creature enters, you may sacrifice any number of creatures. It enters with that many +1/+1 counters on it.)
When this creature enters, it deals damage to any target equal to twice the number of Goblins it devoured.

Malfegor

Flying
When Malfegor enters, discard your hand. Each opponent sacrifices a creature of their choice for each card discarded this way.