Secrets of Strixhaven Commander

Creature — Human Wizard

Skulk (This creature can't be blocked by creatures with greater power.)
This creature enters with X +1/+1 counters on it.
At the beginning of your upkeep, if this creature has one or more +1/+1 counters on it, you may remove a +1/+1 counter from it. If you do, draw a card.

Ingenious Prodigy

Aetherdrift Commander

Creature — Zombie Horror

Skulk (This creature can't be blocked by creatures with greater power.)
At the beginning of your upkeep, you may discard all the cards in your hand. If you do, draw that many cards.

Forgotten Creation

Doctor Who

Creature — Alien Insect

Skulk (This creature can't be blocked by creatures with greater power.)
Parallel Universe — Whenever this creature deals combat damage to a player, time travel. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter.)

Time Beetle

Artifact Creature — Robot

Skulk (This creature can't be blocked by creatures with greater power.)
Whenever this creature attacks and isn't blocked, it gets +X/+0 until end of turn, where X is the number of attacking artifact creatures.

Cybermat

Tales of Middle-earth Commander

Legendary Creature — Halfling Horror

Skulk (This creature can't be blocked by creatures with greater power.)
At the beginning of your end step, each opponent dealt combat damage this game by a creature named Gollum, Obsessed Stalker loses life equal to the amount of life you gained this turn.

Gollum, Obsessed Stalker

Unfinity Sticker Sheets

Stickers

{TK}{TK} — Skulk (This creature can't be blocked by creatures with greater power.)
{TK}{TK}{TK} — Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
{TK}{TK} — 3/2
{TK}{TK}{TK}{TK}{TK} — 6/8

Space Fungus Snickerdoodle

Commander Legends: Battle for Baldur's Gate

Eldrazi Horror

Creature — Human Horror

Skulk (This creature can't be blocked by creatures with greater power.)
Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card.
Whenever you discard a creature card, you may pay {2}. If you do, create a 3/2 colorless Eldrazi Horror creature token.

Wharf Infiltrator

Universes Within

Legendary Creature — Human Advisor

Skulk (This creature can't be blocked by creatures with greater power.)
Whenever Gregor, Shrewd Magistrate deals combat damage to a player, draw cards equal to its power.

Gregor, Shrewd Magistrate

The List

Creature — Spirit

Skulk (This creature can't be blocked by creatures with greater power.)
When this creature enters, target creature an opponent controls doesn't untap during its controller's next untap step.

Fogwalker

Skulk (This creature can't be blocked by creatures with greater power.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Farbog Revenant

Eldritch Moon

Creature — Vampire Rogue

Vampire Cutthroat

Creature — Nightmare

Skulk (This creature can't be blocked by creatures with greater power.)
When this creature deals combat damage to a player, return it to its owner's hand.

Persistent Nightmare

Shadows over Innistrad Promos

Shadows Over Innistrad Checklist 2

Sorcery

Target opponent mills thirteen cards.
{3}{U}{U}: Put this card from your graveyard onto the battlefield transformed. Activate only as a sorcery.

Startled Awake

Shadows over Innistrad

Creature — Homunculus

Skulk (This creature can't be blocked by creatures with greater power.)

Furtive Homunculus

Unimpeded Trespasser

Shadows Over Innistrad Checklist 1

Skulk (This creature can't be blocked by creatures with greater power.)
When this creature deals combat damage to a player, transform it.

Uninvited Geist

Skulk (This creature can't be blocked by creatures with greater power.)
When this creature enters, discard a card.

Pale Rider of Trostad

Creature — Zombie Rat

Skulk (This creature can't be blocked by creatures with greater power.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)