They're a topic that generates a lot of impassioned discussion, mostly because every time they come up, everyone starts arguing about the affordability of Magic and how WotC makes the game too expensive to play. There is increasing acceptance of proxies in certain situations , especially provided you are not trying to use fake cards and pass them off as real or using them in tournaments where they're not allowed
I explained my worries to him
A 3/3 Esper Sentinel effectively shuts down non-creature spells or provides massive card advantage
This means you reanimate or cast it and then wait through the phases for the turn to wheel before the Muse does its thing, which is rarely acceptable to the table
Magic lets you do that sometimes, with an entire collection of cards dedicated to seeing what your next draws going to be
Pygmy Giant Ive always been a fan of Pygmy Giant, because it self-sacrifices for 487 damage which will kill most creatures