The entire game plan with her is to cast as many instant/sorcery spells as you can and use her -1 ability to find another spell to cast, preferably an instant or sorcery
Could this new format lead to specific cards being printed for it, much like with Commander cards in Magic: The Gathering
Theyre all still good and have their moments of being really problematic, but theyre comfortably below the stuff above it, all of which have some blend of cheapness, durability, and your inability to function until theyre removed
Buffing her Strength with item cards can make her stronger, but even unmodified, Tinker Bell - Giant Fiary is a must-have card in any player's deck
Each person at the table is going to be working toward a plan to advance their position and set you back, so you should make sure you are similarly prepared
Dark Deal, Magus of the Wheel, Windfall, Reforge the Soul, and Wheel and Deal are all excellent choices on that front