Keep in mind that the buff effect is only sorcery speed, while the draw a card effect is not
Grazilaxx, Illithid Scholar The best home I can think of for Grazilaxx, Illithid Scholar is a ninja deck, where you often want the option of bouncing your own creatures, and youre running a few value ETB creatures anyway
Another contributing factor to the cards value was the fact that the card was released during the seventh generationthe peak of Mimikyus popularity
I've noticed that as well
Then, when at least one creature with counters on it deals damage to a player, you draw a card and proliferate, meaning that all your creatures with at least one token receive an additional token
Sacrificing a creature is also on theme for what black wants to do