Use the number of artifact creatures you control when Robobrain War Mind's second ability resolves, including Robobrain War Mind itself if it's still on the battlefield, to determine the number of energy counters you get
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Ideally, you'll be able to kill the Infect creature while your opponent is tapped out, but if your opponent plays carefully and leaves up mana, it's still often better to cast removal during your turn, since if the Infect player does have a Blossoming Defense or Vines of Vastwood, at least they won't be able to get in extra infect damage by using it to pump their threat
The most immediately exciting options to me are to use it to give Lightning Bolt or Manamorphose storm
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This is a great way to introduce newcomers to MTG , and if successful, could become its own format further down the line, especially with its way to scale difficulty up or down depending on needs