Watcher of the Roost

Most morph creatures gate the flip behind mana, holding you hostage to how much you left open; this one asks for information instead. Reveal a white card you already hold and the disguise drops for free, which is the whole design pivot: the unmorph is a color check, not a mana check. That trade does two jobs. It confines the trick to decks committed to white, since you need a white card in hand to point at, and it decouples the flip from your untapped lands entirely, so you can turn it over on any turn no matter how tapped out you are. The 2/1 flyer and the two life it grants are almost incidental. What you are actually buying is a plain body deployed early that converts into evasion at the precise moment combat math swings, paid with a card you were never planning to spend. A ground creature that suddenly blocks in the air, or a nonentity that ambushes an attacker, all financed by a reveal that costs you nothing you needed. The lifegain is a small tax rebate on the whole exchange, not the reason to run it.