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You can often double your mana by tapping out in your main phase, or you can attack first to force a player you suspect to be holding countermagic to tap out

I also think this is far from the best way to do it

66 Minun

Your best win condition is to stick an Unholy Annex and simply run them out of resources, but it won't be easy to keep a Demon in play (and if you do, you just win anyway) so preserving your life total is critical

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They have one of the best Pendulum cards as well with Dinomist Howling, allowing you to set two Scales directly from your deck