Deranged Assistant

Mana dorks are usually green, because acceleration is green's color and ramping into your spells faster is green's reward. This one routes the same effect through blue by attaching a cost the dork's own controller has to want: every tap feeds your graveyard a card. That self-mill clause is not incidental flavor; it is the whole reason a blue creature gets to make mana at all. Where the graveyard is itself a resource (flashback spells to recur, threshold counts to reach, fatties to reanimate), the milled card is a second payoff stacked on top of the colorless mana, and the body's fragility stops mattering once it has run a few activations. Where the deck just wants ramp, that same clause becomes a real cost, thinning your library and risking the cards you actually meant to draw. The design lives entirely in that tension: it is acceleration priced for the player who has already decided their library and graveyard are the same pile. Strip the mill and you have a strictly worse green dork in the wrong color; keep it, and you have a colorless-mana engine built for a graveyard-centric blue shell that green ramp could never serve, where each activation pays out twice and the only question is whether your deck wanted the second payment.