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Blue doesn't usually have a ton, but there are a few cards like Cloud of Faeries and Peregrine Drake that can go a long way with the help of mana doublers or Ravnica bounce lands

Things take off from there

Another common way to get the most from your discard decks are cards that punish your opponent for having an empty or near-empty hand

These cards have a direct effect over the game and if you want to get rid of them or interact with them in any way, youre going nowhere fast

Its a positive step, to be sure, but it doesnt address the underlying problem

Combine it with Chromatic Orrery and the mana only being blue isn't even a limit anymore