mtg final fantasy cactuar Jumbo Regular MTGNexus - Cactuar

After all the card effects are resolved, then the card is discarded

That includes the card you normally draw during your draw step and any other effect that allows you to draw cards before Sylvan Librarys trigger resolves

Opponents can also try to attack the Mayhem Devil aspect of the deck by loading up on interaction to keep you from reaching a critical mass

It follows that you will be selling your cards to an active community

For example, if you control Eladamri, Korvecdal ("You may cast creature spells from the top of your library") and Ondu Knotmaster is on top of your library, you can cast Ondu Knotmaster, but not Throw a Line