Kuro's Taken

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
{1}{B}: Regenerate Kuro's Taken.

Fumarole

As an additional cost to cast this spell, pay 3 life.
Destroy target creature and target land.

Aether Sting

Whenever an opponent casts a creature spell, Aether Sting deals 1 damage to that player.

Sokenzan Spellblade

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)
{1}{R}: Sokenzan Spellblade gets +X/+0 until end of turn, where X is the number of cards in your hand.

Phyrexian Purge

This spell costs 3 life more to cast for each target.
Destroy any number of target creatures.

Nezumi Cutthroat

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Nezumi Cutthroat can't block.

Howl from Beyond

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

Mountain

Tor Wauki

{T}: Tor Wauki deals 2 damage to target attacking or blocking creature.

Rain of Embers

Rain of Embers deals 1 damage to each creature and each player.

Firebreathing

Enchant creature
{R}: Enchanted creature gets +1/+0 until end of turn.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Pestilence Rats

Pestilence Rats's power is equal to the number of other Rats on the battlefield. (For example, as long as there are two other Rats on the battlefield, Pestilence Rats's power and toughness are 2/3.)

Moor Fiend

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Emissary of Despair

Flying
Whenever Emissary of Despair deals combat damage to a player, that player loses 1 life for each artifact they control.

Diseased Vermin

Whenever Diseased Vermin deals combat damage to a player, put an infection counter on it.
At the beginning of your upkeep, Diseased Vermin deals X damage to target opponent previously dealt damage by it, where X is the number of infection counters on it.

Anurid Murkdiver

Lost Soul

Swamp

Blanket of Night

Each land is a Swamp in addition to its other land types.

Enrage

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Plague Rats

Plague Rats's power and toughness are each equal to the number of creatures named Plague Rats on the battlefield.

Fiery Conclusion

As an additional cost to cast this spell, sacrifice a creature.
Fiery Conclusion deals 5 damage to target creature.

Severed Legion

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Dirtwater Wraith

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
{B}: Dirtwater Wraith gets +1/+0 until end of turn.

Viashino Fangtail

{T}: Viashino Fangtail deals 1 damage to any target.

Bog Wraith

Gnat Miser

Each opponent's maximum hand size is reduced by one.

Locust Miser

Each opponent's maximum hand size is reduced by two.

Army Ants

{T}, Sacrifice a land: Destroy target land.

Bog Rats

Lightning Elemental

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

Dragon's Claw

Whenever a player casts a red spell, you may gain 1 life.

Necromantic Thirst

Enchant creature
Whenever enchanted creature deals combat damage to a player, you may return target creature card from your graveyard to your hand.