Since youll pay life rather than mana to cast opponents spells, youll need lifegain effects, something that black cards have plenty of: Gray Merchant of Asphodel or Sheoldred, the Apocalypse balance out the life costs for casting opponents cards you exile after combat damage
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The adorable Budew IR is only around $30, Dreepy IR is roughly $40, and the Canari Ultra Rare is just $30
If the "One Ring" card sells for the proposed $2 million, it will shatter all previous records and become the most valuable Magic: The Gathering card of all time
We still have Eri to interact with our opponents hand and if we notice they are sitting on a bunch of Boss or have their own Team Yells Cheer in hand, we can pivot back into swinging with Luxray
So, if you need to use a deck builder (or a strange voice in the aether asks you for an answer to this question), this is the one I recommend