This creature's controller and that player each draw half that many cards, rounded down." Preventing player damage (or damage to your MTG Commander) is a pretty powerful play, especially when the only cost is allowing you and your opponent to both draw cards
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That does mean that the enchantment is unlikely to stick around forever, but that doesnt make it any less frustrating to play against
It gets to keep all the special abilities and effects they have though, letting you have extra copies of them out and about
Legacy and Vintage are great formats, and most players would be perfectly fine with playing against opponents with some number of proxies in their decks if it meant they could play their favorite format on a regular basis
So any megas that either hits crazy out of the gate as a stage 1/basic can be a huge demerit if you don't stop your opponent, or you have two meat shields that will get you to the last guy that will win you the whole game
