Another card that I used to use in mono U control was Rhystic Study. It costs more, and they have to pay less, but it has no upkeep and it effects every spell. In type 1 mana is at a premium, so you can't always afford to pay that 1 extra.
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I see how Rhystic Study could be just as effective as Mystic Remora, but the point you make has to go both ways. If your opponent can't always afford the 1 mana to keep you from drawing, then you have to remember that you won't always be able to afford the 2 more mana that Rhystic is going to need to play in the first place.