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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

they're the same card, they just have different artwork

While this ensures that each player is regularly attacking, whenever a creature attacks you or a Planeswalker you control, a +1/+1 counter is put on Thantis, allowing it to become a major threat if you continue to be targeted by opponents

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