Infectious Horror

Nyxathid

Creature — Elemental (7/7)

As Nyxathid enters the battlefield, choose an opponent.
Nyxathid gets -1/-1 for each card in the chosen player's hand.

Fleshformer

Creature — Human Wizard (2/2)

: Fleshformer gets +2/+2 and gains fear until end of turn. Target creature gets -2/-2 until end of turn. Activate only during your turn. (A creature with fear can't be blocked except by artifact creatures and/or black creatures.)

Pestilent Kathari

Creature — Bird Warrior (1/1)

Flying
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
: Pestilent Kathari gains first strike until end of turn.

Sedraxis Alchemist

Creature — Zombie Wizard (2/2)

When Sedraxis Alchemist enters the battlefield, if you control a blue permanent, return target nonland permanent to its owner's hand.

Sludge Strider

Artifact Creature — Insect (3/3)

Whenever another artifact enters the battlefield under your control or another artifact you control leaves the battlefield, you may pay . If you do, target player loses 1 life and you gain 1 life.

Maelstrom Archangel

Creature — Angel (5/5)

Flying
Whenever Maelstrom Archangel deals combat damage to a player, you may cast a spell from your hand without paying its mana cost.

Child of Alara

Legendary Creature — Avatar (6/6)

Trample
When Child of Alara dies, destroy all nonland permanents. They can't be regenerated.

Fusion Elemental

Creature — Elemental (8/8)

Rhox Bodyguard

Creature — Rhino Monk Soldier (2/3)

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
When Rhox Bodyguard enters the battlefield, you gain 3 life.

Scarland Thrinax

Creature — Lizard (2/2)

Sacrifice a creature: Put a +1/+1 counter on Scarland Thrinax.

Shambling Remains

Creature — Zombie Horror (4/3)

Shambling Remains can't block.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Sphinx Summoner

Artifact Creature — Sphinx (3/3)

Flying
When Sphinx Summoner enters the battlefield, you may search your library for an artifact creature card, reveal it, put it into your hand, then shuffle.

Vectis Agents

Artifact Creature — Human Rogue (4/3)

: Vectis Agents gets -2/-0 until end of turn and can't be blocked this turn.

Frontline Sage

Creature — Human Wizard (0/1)

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
, : Draw a card, then discard a card.

Giltspire Avenger

Creature — Human Soldier (2/2)

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
: Destroy target creature that dealt damage to you this turn.

Kederekt Parasite

Creature — Horror (1/1)

Whenever an opponent draws a card, if you control a red permanent, you may have Kederekt Parasite deal 1 damage to that player.

Parasitic Strix

Artifact Creature — Bird (2/2)

Flying
When Parasitic Strix enters the battlefield, if you control a black permanent, target player loses 2 life and you gain 2 life.

Brackwater Elemental

Creature — Elemental (4/4)

When Brackwater Elemental attacks or blocks, sacrifice it at the beginning of the next end step.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Cliffrunner Behemoth

Creature — Rhino Beast (5/3)

Cliffrunner Behemoth has haste as long as you control a red permanent.
Cliffrunner Behemoth has lifelink as long as you control a white permanent.

Ember Weaver

Creature — Spider (2/3)

Reach (This creature can block creatures with flying.)
As long as you control a red permanent, Ember Weaver gets +1/+0 and has first strike.