She's a mere 4/4, but she's also got a rather powerful mind-control effect, temporarily resurrecting a creature she personally slew, and having that creature fight for you as long as she's around
Cards with a rating of one star or higher can be exchanged for Special Shop Tickets
Over three turns of value, you will get 2 creatures and an unknown set of lands
So, so many cards in Magic use a counter of one kind or another to track their power or otherwise generate value
Granting Mickey resist and readying him after a challenge might be hard, but can also get you to play an additional character for free if readying him doesn't stop him from challenging again
Due to their rarity, most transactions involving Yamato Trophy take place between collectors rather than appearing at public auctions