Two of the easiest upgrade paths would be to head toward a big artifact / reanimator strategy with cards like Goblin Welder, Daretti, Scrap Savant, and other huge artifact finishers like Wurmcoil Engine, or play a token- / Thopter-themed deck with the help of cards like Sai, Master Thopterist, Pia and Kiran Nalaar, and friends
her Blue, card-draw facilitation reflects her Materia-hunting background, while her Black-deck chip damage represents her strength in battle
Theyre not game-warping, with the exception of maybe Shizo, Death's Storehouse, but they interact favorably with cards that count legendary permanents
Meanwhile, Ossification joins Nahiri's Warcrafting in our removal suite, in part because we can tutor it up with Kellan, the Fae-Blooded in a pinch