You can easily run cards that will abuse it, from Sakura-Tribe Elder or Bone Shredder to Attrition or Perilous Forays
The cards #D effect is subtle enough to keep the cards legal in sanctioned Magic formats
You do get a reward in the form of an infinite and automatic copy effect, which can snowball very quickly with the right setup, although you still dont necessarily win the game outright after transforming
Wait for two of your opponents to get into combat with each other and if you see a big guy blocking a little guy, hit the little guy with this and voila
The majority of the value of the deck comes from the newer cards, like Swift Reconfiguration ($15), Drumbellower ($8), and Imposter Mech ($4), so that price could fluctuate based on how much demand we see for these cards
Players have adopted various nicknames over the years