Furtive Homunculus

Skulk is evasion that scales with the board instead of ignoring it. Where flying or shadow simply opt out of blocking, this 2/1 stays unblockable only against creatures of greater power, which makes the keyword a meaningful design lever: the smaller the attacker, the easier it slips through. That runs exactly backwards from how aggression usually wants to size up, and it is the friction the mechanic trades on. A 2/1 sneaks past anything with three or more power but gets stopped cold by a 1/1 or a 2/2, so the card wants the curve low and the window early, before the board fills with cheap blockers it can no longer beat. The wrinkle is that the obvious way to push damage works against the keyword: a pump spell or a piece of equipment raises this creature's power, which only widens the pool of creatures allowed to block it. The pilot's job is to read the board and connect while opposing creatures are still bigger, rather than make the attacker bigger itself. As a body it is common-rarity filler in the strictest sense, but it demonstrates skulk cleanly: a fragile attacker whose evasion is a function of timing and relative size rather than a permanent trait, and an evasion keyword that, unlike most, can be answered by going small.