Legality depends on the tournament format -- Prosperity can be legal in some formats and banned or restricted in others
So Ill spare you a lengthy repeat of my analysis, and just say that Caretakers Talent is still on the upswing
Until its removal, defining who could and could not do what was mostly a theoretical exercise
There is a catch though these critters only come alive on your turn and only if they're of mana value 4 or more
Decks that run Team Star Grunt tend to be less focused on aggression strategies and are typically more focused on an alternative strategy, like control
Mega Charziard X, Mega Gengar, Mega Slowbro, Mega Manectric, and Mega Scizor all have 2-Shiny cards you're going to have to track down to unlock that emblem