Counterspell

Black Knight

First strike (This creature deals combat damage before creatures without first strike.)
Protection from white (This creature can't be blocked, targeted, dealt damage, or enchanted by anything white.)

Mind Twist

Target player discards X cards at random.

Cockatrice

Flying
Whenever Cockatrice blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Giant Growth

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

Animate Artifact

Enchant artifact
As long as enchanted artifact isn't a creature, it's an artifact creature with power and toughness each equal to its mana value.

Llanowar Elves

Island

Bayou

Paralyze

Enchant creature
When Paralyze enters, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
At the beginning of the upkeep of enchanted creature's controller, that player may pay {4}. If the player does, untap the creature.

War Mammoth

Howl from Beyond

Target creature gets +X/+0 until end of turn.

Tropical Island

Channel

Until end of turn, any time you could activate a mana ability, you may pay 1 life. If you do, add {C}.

Swamp

Elvish Archers

Dark Ritual

Psionic Blast

Psionic Blast deals 4 damage to any target and 2 damage to you.

Unsummon

Return target creature to its owner's hand.

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Grizzly Bears

Forest

Underground Sea

Lord of the Pit

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than Lord of the Pit. If you can't, Lord of the Pit deals 7 damage to you.