The only problem I have is that I can think of no instances in which this card would DECREASE costs, except for steam machine. It'd be more versatile, and as is the only way I can see this card ever being used with decrease being the point is in some sort of
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duo with Guru's and steam machines...Actually no, that wouldn't work either. The 2
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decrease isn't enough to warrant it.
So....Mono time maybe? Rush creatures out with precogs/dials/hourglasses, then once you've summoned what you need, throw a guru down to slow down the enemy?