Ghen, Arcanum Weaver

A recursion engine built entirely around the enchantment as a resource, and its ability reads like a self-fueling loop the moment you own an enchantment worth sacrificing. The cost is deliberately steep: you pay all three of the deck's colors, tap the creature, and give up an enchantment you already control just to reclaim one from the graveyard. That trade only makes sense when the enchantment coming back is worth more than the one going away, or when the one you sacrifice has a leaves-the-battlefield payoff of its own. The sacrifice clause is what gives the card its function: it turns Ghen into a piston for aura and Saga rebuys, blink-adjacent value without the blink, letting an enchantment enter and exit and enter again for its triggers. Sagas in particular pair cleanly, since resetting one to chapter one is exactly the loop the card wants. The Mardu color identity says plainly that this was meant to head a build rather than support one: red and black rarely traffic in enchantment matters, so the archetype had to be assembled from three colors that individually offer little of it. What holds the whole thing together is the once-per-turn tap, which keeps a single Ghen from grinding an entire graveyard back in one turn and forces the deck to spend its recursion where it counts most.