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Typically these are used in concert with discard effects in decks with heavy graveyard synergy as you will want specific things in the bin and wont be able to control whether you draw them or not

Another example is with Sagas

page 3 b yugioh-card.com English version usage rules (japanese) "Konami Survey #1"

Your local Pokmon League may permit the use of proxies during open play for testing purposes, but in all other instances, proxies should be treated exactly the same as other fake cards

It has flying, and its highly unlikely in the early-game everyone will have blockers, so its relatively small body isnt a problem