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Wan Shi Tong, Librarian Wan Shi Tong, Librarian is such a nice card advantage engine because it already draws you some cards when it enters

THE DARK ART OF OPTIMAL RESOURCE EFFICIENCY The fundamental logic for building around discard effects is similar to that of sacrifice you take something normally considered a drawback by the designers and then try to flip into either a neutral or even positive exchange

Same caveat applies that this is probably much better if the formats slow, which makes it a more appealing Sealed card

There's the concept of virtual card advantage, which basically equates getting rid of dead cards as effectively the same as drawing cards

This is a lot to pay, but this ability can be activated as many times as its controller wants, though it has to be at sorcery speed