But there are a whole ton of other benefits to playing them as well
Bennie Bracks, Zoologist is an Elf, but you're never going to try to build mono-White Elves with him as your commander
It can generate mana, deal damage, disrupt a graveyard, and heal
Proxies can be useful for testing decks or playing casual games with friends
It just uses the word, "Swamp." Another good example is extort, which has the Black and White symbols in the reminder text, or a fetchland like Mountain Valley that clearly is Red and Green in flavor and mechanically, but is allowed in decks without Red or Green
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