Gavony Dawnguard

Most value creatures pay off when they enter the battlefield; this one pays off on transition instead, and the whole engine hangs on that difference. The dig fires only when day becomes night or night becomes day, so a static 3/3 body accomplishes nothing on its own clock: the trigger is welded to the swing of the phase meter, not to arrival. That timing forces a specific kind of shell. When the game sits in the neutral state (neither day nor night), the creature sets it to day as it enters, but that transition into day from neutral is not itself a night-to-day or day-to-night flip, so it does not fire the look. What it does is start the clock: with day established, the next shift of the meter finally lands as a triggering event, and from then on every swing looks four deep and refills a low curve of small creatures. Ward is the modest targeting tax that keeps the delivery vehicle on the table long enough for those swings to accumulate; it does not stop blocks, it just makes the removal to kill it cost a little more. The sharp part of the construction is that its fuel is the game state rather than mana or life: build around cards that keep pushing the meter (spells that shift day and night, permanents that transform on the swing) and the top-four look becomes a recurring, phase-gated tutor. Strip out the rhythm and the trigger simply never happens.