If a sleeve is chipped in a small but noticeable way, the marking can make it illegal to play with in any official tournament
It doesn't have to be attacking the same player, planeswalker, or battle that the non-Human creature is attacking
Exile those tokens when Mysterio leaves the battlefield
Obviously this card is best when your opponent is forced to take your 1/1 token or your nothing, so look to include this in decks that can work towards that board state with non-creature defense like [card]Propaganda[/card] and the freshly reprinted [card]Crawlspace[/card]
If you havent already read my article on building a standard 60-card MTG deck, go ahead and give it a read
Whats Happening: One week ahead of its wide release, Chapter 9 of the hugely popular Disney Lorcana Trading Card Game is set to make its early debut at Walt Disney World