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We call them playtest cards, because they look like what we use to, well, playtest cards before making the real thing

Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Hedonist's Trove: The cards are exiled face up

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That would kind of be the start point

Cards that deal non-combat damage (to any target or specifically to battles) are the only other sources that can remove defense counters on battle cards manually