Volcanic Dragon

Flameblast Dragon

Creature — Dragon (5/5)

Flying
Whenever Flameblast Dragon attacks, you may pay . If you do, Flameblast Dragon deals X damage to any target.

Furyborn Hellkite

Creature — Dragon (6/6)

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

Bonebreaker Giant

Creature — Giant (4/4)

Inferno Titan

Creature — Giant (6/6)

: Inferno Titan gets +1/+0 until end of turn.
Whenever Inferno Titan enters the battlefield or attacks, it deals 3 damage divided as you choose among one, two, or three targets.

Chandra's Phoenix

Creature — Phoenix (2/2)

Flying
Haste (This creature can attack and as soon as it comes under your control.)
Whenever an opponent is dealt damage by a red instant or sorcery spell you control or by a red planeswalker you control, return Chandra's Phoenix from your graveyard to your hand.

Crimson Mage

Creature — Human Shaman (2/1)

: Target creature you control gains haste until end of turn. (It can attack and this turn.)

Goblin Chieftain

Creature — Goblin (2/2)

Haste (This creature can attack and as soon as it comes under your control.)
Other Goblin creatures you control get +1/+1 and have haste.

Lightning Elemental

Creature — Elemental (4/1)

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

Archon of Justice

Creature — Archon (4/4)

Flying
When Archon of Justice dies, exile target permanent.

Belltower Sphinx

Creature — Sphinx (2/5)

Flying
Whenever a source deals damage to Belltower Sphinx, that source's controller mills that many cards.

Bloodlord of Vaasgoth

Creature — Vampire Warrior (3/3)

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
Flying
Whenever you cast a Vampire creature spell, it gains bloodthirst 3.

Chasm Drake

Creature — Drake (3/3)

Flying
Whenever Chasm Drake attacks, target creature you control gains flying until end of turn.

Djinn of Wishes

Creature — Djinn (4/4)

Flying
Djinn of Wishes enters the battlefield with three wish counters on it.
, Remove a wish counter from Djinn of Wishes: Reveal the top card of your library. You may play that card without paying its mana cost. If you don't, exile it.

Pentavus

Artifact Creature — Construct (0/0)

Pentavus enters the battlefield with five +1/+1 counters on it.
, Remove a +1/+1 counter from Pentavus: Create a 1/1 colorless Pentavite artifact creature token with flying.
, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

Peregrine Griffin

Creature — Griffin (2/4)

Flying
First strike (This creature deals combat damage before creatures without first strike.)

Sengir Vampire

Creature — Vampire (4/4)

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by Sengir Vampire this turn dies, put a +1/+1 counter on Sengir Vampire.

Sphinx of Uthuun

Creature — Sphinx (5/6)

Flying
When Sphinx of Uthuun enters the battlefield, reveal the top five cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.

Stingerfling Spider

Creature — Spider (2/5)

Reach
When Stingerfling Spider enters the battlefield, you may destroy target creature with flying.

Thran Golem

Artifact Creature — Golem (3/3)

As long as Thran Golem is enchanted, it gets +2/+2 and has flying, first strike, and trample.

Acidic Slime

Creature — Ooze (2/2)

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters the battlefield, destroy target artifact, enchantment, or land.