Ephara's Dispersal + auto-tapper
Attached are some images showing how when you autotap for mana playing any other card, you will tap out on blue as if the game does not at all care that Ephara has a reduced cost. It's pretty clear and appears to happen all the time regardless of any special situation.
Ephara's Disperal has a reduced casting cost, one you nearly always use, of U.
Autotapper will in this case tap out all your blue for no reason and not even remotely prioritize reduced costs.
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