Hilde's Draw & Release III seems like something that can be exploited with future attunement-based characters.
Here's just a meme build.
Rei is just placeholder. Idk if her +attack amount actually apply to secondary effect like Selena's attunement. It'd be nice if it does.
Other candidates are Heide and Tene.
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I happened to build something similar but with Cassius instead of Rei. Cass' deck is just one Joker, two eternal hunger and three shuffle IV with Nihilum divine granting 50% chance to stay in hand instead of exhaust. This lets you move the draw & release back to the draw pool and chain it with big game ranger draw 2 or eternal hungers to sustain the draw. Pretty broken combo, I think there's a lot of cool potential with this setup!
I think it'll be better with future attunement-based card (whether it's neutral or seasonal or characters). Right now, we only have like a few attunement cards.