Like the title says Instead of indivudually choosing attack targets for creatures, you can attack planeswalkers by clicking all the creatures you want to attack the planeswalker first, and then clicking the planeswalker
Maybe I was just an idiot, As I've normally clicked the creature I wanted to attack, then the target planeswalker, then the next creature I wanted to attack , then the planeswalker and so on.
This way of playing is way more efficient with all these plneswalkers running around
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