Nightwhorl Hermit

Threshold has always paid off a graveyard filled fast, and the reward here is a mode-flip rather than a stat bump you'd shrug at. Before the seventh card hits the yard, this is a 1/4 with vigilance: a wall that blocks and survives while your self-mill or spell-heavy plan does its work, its single point of power almost beside the point. Cross the threshold and the same body becomes an evasive clock no blocker can touch, attacking with impunity while still standing back on defense thanks to vigilance. That pairing is the design: a creature that guards a delayed engine early and then converts into that engine's win condition once the enabling has already happened. Blue's graveyard-fueled decks tend to bury the opponent in card advantage without a clean way to close, and this fills that structural gap with one card that plays both roles across a game's arc. The wrinkle is that the buff is conditional and reversible; anything that exiles your graveyard or pulls it below seven strips the unblockable clause right back off, folding the attacker into a wall again mid-race. It asks you to keep the graveyard stocked as a running cost, not clear it once. A self-contained payoff that pulls double duty rather than a marquee build-around: the kind of three-drop a fill-the-yard shell is glad to have holding a slot until the yard is deep enough to turn it loose.