But her true power is her ability to proliferate at the end of your turn, adding another counter of each kind to any number of permanents or players for free
In general, the best way to play Xanathar, Guild Kingpin isn't to simply cast as many of our opponent's spells as possible but to play some cards and then try to leave our opponent with a useless card (most often a land) on the top of their deck, which is almost like making our opponent skip their next draw and, if our opponent is empty-handed, pretty close to making our opponent skip their turn
High-grade Alpha cards are rare, as MTG cards from the early days were heavily played, traded, and often damaged due to the lack of protective sleeves
Also, don't forget to cast it on turn two so you can use it on turn three if you need to
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