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Based on the rules text saying "you may remove a counter," this means if you deal combat damage and only have the hexproof counter, but want to keep it, you can pass on activating the ability

(To mill a card, put the top card of your library into your graveyard.) The last activated ability doesn't target any creature cards in graveyards

The Aetherspark also can't be attacked when it's equipped to another creature, making removing this planeswalker through combat pretty tricky

But for now, heres looking forward to finding out what it means to Mutate creatures and researching the design forebears of it and Ikorias other new mechanics