: Target white creature gains persist until end of turn. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Whenever you draw a card, put a +1/+1 counter on Chasm Skulker.

When Chasm Skulker dies, create X 1/1 blue Squid creature tokens with islandwalk, where X is the number of +1/+1 counters on Chasm Skulker. (They can't be blocked as long as defending player controls an Island.)

Expedition Skulker has deathtouch as long as you control another Rogue.

: Target green creature gets +1/+1 until end of turn.

Lifelink, protection from mana value 3 or greater

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters the battlefield with a +1/+1 counter on it.)

Creatures with power less than Skarrgan Pit-Skulk's power can't block it.

Flying

When Skulking Ghost becomes the target of a spell or ability, sacrifice it.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

When Skulking Knight becomes the target of a spell or ability, sacrifice it.