Waterlogged Hulk // Watertight Gondola

Craft's tidiest closed loop lives here, because the front artifact does the graveyard-stocking that its evolved form wants. Tapping to mill a card at a time is patient work with a purpose: every activation nudges the count toward descend 8, the static threshold that makes the transformed Vehicle an unblockable clock once the graveyard is deep enough. The cheap artifact you cast early is never idle; it is grinding toward the exact number the back face reads, no external self-mill required. The transform cost is the wrinkle worth sitting with. The is the mana half, but craft also demands you exile an Island, one on the battlefield or one already in your graveyard, and the graveyard option cuts against the yard rather than adding to it: exile from play removes a permanent you no longer need, exile from the graveyard actively trims the number descend 8 is checking. So the flip is a tension, not a free upgrade: you spend down toward the transform while the back face wants that graveyard as full as possible. Once flipped, vigilance keeps it live on defense, crew 1 animates it off a single token or mana dork, and the evasion switches on purely as a reading of permanent cards in your graveyard (nothing is consumed to sustain it; descend 8 simply checks and rechecks). A two-permanent engine folded into one card, where milling your own library is not incidental value but the meter that unlocks the clock.