Typhoid Rats

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

Torch Fiend

{R}, Sacrifice Torch Fiend: Destroy target artifact.

Defender (This creature can't attack.)
{3}: Until end of turn, Gargoyle Sentinel loses defender and gains flying.

Defender (This creature can't attack.)
{R}: Wall of Fire gets +1/+0 until end of turn.

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

{2}{B}: Zof Shade gets +2/+2 until end of turn.

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

Flying (This creature can't be blocked except by creatures with flying or reach.)
Carrion Crow enters tapped.

Flying
At the beginning of your upkeep, draw a card unless target opponent sacrifices a creature of their choice or pays 3 life.

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

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

Nonblack creatures get -1/-1 until end of turn.

Lightning Strike deals 3 damage to any target.

Heat Ray deals X damage to target creature.

Blastfire Bolt deals 5 damage to target creature. Destroy all Equipment attached to that creature.

Destroy target creature. It can't be regenerated.

Whenever a creature card is put into an opponent's graveyard from anywhere, you gain 1 life.

Enchant creature
Enchanted creature gets -2/-2.
At the beginning of the upkeep of enchanted creature's controller, that player loses 2 life.

Enchant land
Enchanted land has "{T}: Target player loses 3 life."

Enchant creature
Enchanted creature has "{T}: This creature deals damage equal to its power to any target."