Bog Wraith

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

Aspect of Wolf

Enchant creature
Enchanted creature gets +X/+Y, where X is half the number of Forests you control, rounded down, and Y is half the number of Forests you control, rounded up.

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.)

Scavenging Ghoul

At the beginning of each end step, put a corpse counter on Scavenging Ghoul for each creature that died this turn.
Remove a corpse counter from Scavenging Ghoul: Regenerate Scavenging Ghoul.

Raise Dead

Return target creature card from your graveyard to your hand.

Zombie Master

Other Zombie creatures have swampwalk. (They can’t be blocked as long as defending player controls a Swamp.)
Other Zombies have “: Regenerate this permanent.”

Sea Serpent

Sea Serpent can’t attack unless defending player controls an Island.
When you control no Islands, sacrifice Sea Serpent.

Bog Wraith

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

Rock Hydra

Rock Hydra enters the battlefield with X +1/+1 counters on it.
For each 1 damage that would be dealt to Rock Hydra, if it has a +1/+1 counter on it, remove a +1/+1 counter from it and prevent that 1 damage.
: Prevent the next 1 damage that would be dealt to Rock Hydra this turn.
: Put a +1/+1 counter on Rock Hydra. Activate this ability only during your upkeep.

Sea Serpent

Sea Serpent can’t attack unless defending player controls an Island.
When you control no Islands, sacrifice Sea Serpent.

Raise Dead

Return target creature card from your graveyard to your hand.

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.)

Battering Ram

At the beginning of combat on your turn, Battering Ram gains banding until end of combat. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are being blocked by a creature, you divide that creature’s combat damage, not its controller, among any of the creatures it’s blocking.)
Whenever Battering Ram becomes blocked by a Wall, destroy that Wall at end of combat.

Citanul Druid

Whenever an opponent casts an artifact spell, put a +1/+1 counter on Citanul Druid.

Haunting Wind

Whenever an artifact becomes tapped or a player activates an artifact’s ability without in its activation cost, Haunting Wind deals 1 damage to that artifact’s controller.

Urza’s Chalice

Whenever a player casts an artifact spell, you may pay . If you do, you gain 1 life.