Wand of Vertebrae

Most graveyard-fueling tools point in one direction: fill the yard, then exploit it. The second ability is what makes this one strange. The slow tap-to-mill engine does the expected work, feeding delve, threshold, escape, or any deck that wants its own cards in the bin. But the exile clause reads as a deliberate anti-mill safety valve: shuffle up to five cards back into the library, and the artifact consumes itself doing it. That is a one-time reset, and the self-exile is precisely what stops it from being a free, renewable graveyard shield. For combo decks afraid of decking themselves, it buys five cards of headroom; against graveyard hate aimed at you, it pulls your key pieces back out of reach before an opponent can act on them. The tension is that you spend the artifact to do it, ending the mill engine that justified running the thing in the first place. Grinding the library down for value and undoing a chunk of that grind are mutually exclusive modes, and you get the second one exactly once. Cheap enough to deploy without thought, narrow enough that the back half rarely matters until the exact game where it suddenly does.