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While it might seem a bit limited at first, you can do all sorts of shenanigans

Much better in Tempered Steel lists or ones with higher equipment counts but generally still very playable filler even when you have no specific use for it

Sylvan Library however has a built in mechanism whereby you can use it for card advantage as well as card quality or you can let it cost you a card and just use it for quality

For comparison, Ancient Craving does exactly what Phyrexian Arena would do by the end of turn 6, and thats if you always have Arena on turn 3

But her second ability is the kicker, whenever you cast a non-creature spell with mana value 3 or greater, she deals 2 damage to each opponent and you gain 2 life