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Or Kraum can be a finisher in a U/R controlling deck

Every turn you have a possibility of losing a life and drawing a card, and later in the game you can punish them really hard for not having cards in hand at all

As far as the rest of the mana base goes, it's just a mix of cheap lands that add your commanders colors plus EDH-staple utility lands like Reliquary Tower and Temple of the False God

There are also plenty of permanents that generate card draw, whether immediate or over time

Blues free spells is less exciting, owing largely to the fact we already have multiple free counterspells

You could be onto something truly unique