Cards like scheming symmetry, brainstorm, crystal ball, and a number of scry cards can put your 6-9 mana spells on top of the library, so that Yuriko will bleed your opponents for massive amounts of damage each turn
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Unfortunately, at the time, Rosewater didnt give a concrete answer, instead turning the question back on the community
It feels like a Teferi's Protection variant that you dont necessarily need mana for, and itll definitely catch people out when it happens