I think with Yuriko, you usually want split cards to maximize the damage she can deal, while still having castable spells. Some suggestions would be:
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Commit // Memory (total 10 CMC): decent tempo swing, plus kind of a graveyard hate piece
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Never // Return (total 7 CMC): removal + recurrence
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Discovery // Dispersal (total 7 CMC): card advantage and top of library manipulation
I hope you find this useful!