Blue, Loyal Raptor Legendary Creature Dinosaur Partner with Owen Grady, Raptor Trainer (When this creature enters, target player may put Owen into their hand from their library, then shuffle.) For each kind of counter on Blue, Loyal Raptor, each other Dinosaur you control enters with a counter of that kind on it
Ive even seen it as a 99999/3 creature attacking
Three-color legends tend to be popular Commander options, and this one offers a lot of potent text for Spellslinger decks
A big reason would be to interact with others and make friends the social aspect
Personal Reasons due to personal taste, change of mind etc
Offering a body at instant speed that draws cards, Faerie Mastermind seemed powerful in formats as old as even Legacy