Library of Alexandria is card draw on a land so its pretty good at keeping card advantage up
Alternatively, Lumbering Lightshield can perpetually increase the casting cost of a card in your opponents hand by one colorless mana the affected card then maintains that increase whether its cast from hand or somewhere else, like from the graveyard with Flashback or from exile with Foretell
So, would you go the classic white-black route, or an off-beat build like presented here
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The odds of discarding your hand if you have a full grip is only 35%, which isnt awful, but think about the other 65% of the time where you get to draw two cards or return something to your hand
This way, even if they get removed before the final chapter, youve still gotten something for your mana