Cryptid Inspector

A disguise-and-manifest payoff wearing a body plain enough to read as filler, which is exactly the point: it does nothing extra until the deck around it starts flipping cards, and then it scales twice per event. The counter trigger fires on two separate axes. Every time a face-down permanent you control enters, it grows; every time any of your permanents turns face up, it grows again. A single disguise creature can hand it two counters over its life (one on entry, one on the unmorph), and a wide board of face-down things turns each flip into a compounding event. The vigilance is the quiet connective tissue: a creature built to snowball combat is worth more attacking without surrendering the blocking slot, and a growing body that stays back on defense still deters attackers. What balances it is the dependency. Strip out the face-down permanents and it is a 2/3 for three mana with no text worth reading, so it asks the deck to commit to the mechanic rather than splash it. It belongs to the small family of payoffs that reward a theme by counting your own hidden information, growing in proportion to how much of your board is played face down and how often the veil comes off.