Maestros Ascendancy

Grixis recursion routed through a sacrifice, not a mana tax or an exile cost, which changes the shape of the engine more than the substitution suggests. Because each spell recast this way is exiled afterward, the card is not a repeatable outlet for a single instant or sorcery; it grinds through the graveyard's contents rather than looping one of them. That reframes the deckbuilding math. What you want is not one great spell to abuse, but a deep and varied graveyard full of ammunition and a steady supply of expendable bodies (tokens, aristocrat fodder, anything the deck manufactures cheaply) to convert into it, one per turn. The card is really a value converter: creatures in, cast-once spells out, capped at a single conversion during each of your turns. The timing window is worth reading precisely. The "during each of your turns" clause locks the whole thing to turns you control, so the engine never activates while an opponent holds priority, but it does not force sorcery speed. An instant already in your graveyard can still be recast mid-combat or in response to something, provided it is your turn and you have not used the ability yet. The exile clause is what keeps this a slow-burn engine rather than a combo piece: no spell recurs twice off it, so the advantage accrues turn by turn, exactly the incremental grind Grixis midrange has always chased.