Commander as a format has a separate ban list than other Constructed formats
Those decks simply must play a one drop in order to Commander Ninjutsu on Turn 2 reliably, and so much work goes into the math of pulling that off
Blink it, or reanimate it, play it with other artifacts, or with Sphinxes that pillow fort players, and suddenly the person who just gained 100 life with an Ajani ultimate, or even went infinite with lifegain may find themselves one turn away from losing the game
What's worse for Intro to Annihilation, however
Actually, there's no ethical or acceptable reason to make "proxies" to pass the light test, bend test, and other well-known tests to weed out fake cards because there's no ethical or acceptable use of proxies that requires the proxy to be as similar to a real card as possiblea Sharpie on a basic Island does the job just as well and without any of the legal and moral issues