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Then it flips and helps keep you alive, unlike others and lets you recast your and other stuff too that you built around
![mtg commander how many cards in hand Masters Deck [4] Body of Knowledge Commander](https://cards.scryfall.io/normal/front/7/8/786ae686-0790-4ba1-927f-523984331549.jpg?1608909123)
A creature's toughness is simultaneously its defense and its health, as once a creature sustains an amount of damage equal to its toughness, it dies
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Now, onto the intricacies of how duplicate protection will work
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We played with changeling (although note that it didn't become a keyword until development)
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