
Nightfire Giant | Creature | Zombie Giant | Nightfire Giant gets +1/+1 as long as you control a Mountain.
{4}{R}: Nightfire Giant deals 2 damage to any target. | Dave Kendall

Act on Impulse | Sorcery | | Exile the top three cards of your library. Until end of turn, you may play cards exiled this way. (If you cast a spell this way, you still pay its costs. You can play a land this way only if you have an available land play remaining.) | Brad Rigney

Altac Bloodseeker | Creature | Human Berserker | Whenever a creature an opponent controls dies, Altac Bloodseeker gets +2/+0 and gains first strike and haste until end of turn. (It deals combat damage before creatures without first strike, and it can attack and {T} as soon as it comes under your control.) | Cynthia Sheppard

Belligerent Sliver | Creature | Sliver | Sliver creatures you control have menace. (They can't be blocked except by two or more creatures.) | Raymond Swanland

Brood Keeper | Creature | Human Shaman | Whenever an Aura becomes attached to Brood Keeper, create a 2/2 red Dragon creature token with flying. It has "{R}: This creature gets +1/+0 until end of turn." | Scott Murphy

Circle of Flame | Enchantment | | Whenever a creature without flying attacks you or a planeswalker you control, Circle of Flame deals 1 damage to that creature. | Jaime Jones

Cone of Flame | Sorcery | | Cone of Flame deals 1 damage to any target, 2 damage to another target, and 3 damage to a third target. | Chippy

Frenzied Goblin | Creature | Goblin Berserker | Whenever Frenzied Goblin attacks, you may pay {R}. If you do, target creature can't block this turn. | Carl Critchlow

Heat Ray | Instant | | Heat Ray deals X damage to target creature. | Austin Hsu

Kird Chieftain | Creature | Ape | Kird Chieftain gets +1/+1 as long as you control a Forest.
{4}{G}: Target creature gets +2/+2 and gains trample until end of turn. (It can deal excess combat damage to the player or planeswalker it's attacking.) | Lars Grant-West

Might Makes Right | Enchantment | | At the beginning of combat on your turn, if you control each creature on the battlefield with the greatest power, gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn. (It can attack and {T} this turn.) | Mark Winters

Paragon of Fierce Defiance | Creature | Human Warrior | Other red creatures you control get +1/+1.
{R}, {T}: Another target red creature you control gains haste until end of turn. (It can attack and {T} this turn.) | Slawomir Maniak

Shrapnel Blast | Instant | | As an additional cost to cast this spell, sacrifice an artifact.
Shrapnel Blast deals 5 damage to any target. | Hideaki Takamura

Stoke the Flames | Instant | | Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Stoke the Flames deals 4 damage to any target. | Ryan Barger