Rona, Disciple of Gix

Most graveyard-recursion tools hand a card back to its owner's zone: return it to hand, replay it, then let it live and die on the battlefield again. This one relocates the resource entirely. A historic card exiled by the enters trigger leaves the graveyard for a private zone tied to Rona herself, castable whenever the mana lines up but untouchable by the library, the graveyard, and most graveyard hate along the way. That is the real design axis. The trigger is deliberately stingy (one historic card, and only one you have already lost), so she asks a deck to feed artifacts, legendaries, and Sagas into the bin first and mine them back a beat later rather than functioning as a one-shot Regrowth. The colorless activated ability works the same seam from the other end: it exiles the top card of your library directly, adding to the same stash you can later cast off her, and the four-mana tax on that pull keeps the engine deliberately slow. Both halves point at the same idea, that she does not so much generate card advantage as move it, pulling resources out of two zones an opponent expects to be able to attack and parking them under her name. The only key that unlocks that stockpile is keeping the 2/2 alive, which is the cost the design charges for a hoard nobody else can reach.