When Servant of Volrath leaves the battlefield, sacrifice a creature.

Skeleton Scavengers enters the battlefield with a +1/+1 counter on it.

Pay for each +1/+1 counter on Skeleton Scavengers: Regenerate Skeleton Scavengers. When it regenerates this way, put a +1/+1 counter on it.

Counter target spell with mana value X. (For example, if that spell's mana cost is , X is 5.)

When Stalking Yeti enters the battlefield, if it's on the battlefield, it deals damage equal to its power to target creature an opponent controls and that creature deals damage equal to its power to Stalking Yeti.

: Return Stalking Yeti to its owner's hand. Activate only as a sorcery. ( can be paid with one mana from a snow source.)

Prevent all combat damage that would be dealt by target creature this turn. That creature gets +0/+X until end of turn, where X is its mana value.

Flying

Whenever Tethered Skirge becomes the target of a spell or ability, you lose 1 life.

Create a 5/5 blue Wall creature token with defender. Sacrifice it at the beginning of the next end step.

: Add . If you control an Urza's Power-Plant and an Urza's Tower, add instead.

: Add . If you control an Urza's Mine and an Urza's Power-Plant, add instead.

Destroy target permanent.

Defender (This creature can't attack.)

Whenever Wall of Caltrops blocks a creature, if at least one other Wall creature is blocking that creature and no non-Wall creatures are blocking that creature, Wall of Caltrops gains banding until end of turn. (If any creatures with banding you control are blocking a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by.)

Defender (This creature can't attack.)

Flying

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Tap an untapped Zombie you control: Target land becomes a Swamp until end of turn.

Tap an untapped Zombie you control: Target creature gains swampwalk until end of turn. (It can't be blocked as long as defending player controls a Swamp.)