Three different variants of Daretti exist in MTG, and all three of them can sacrifice an artifact in exchange for a benefit
Red, green, and white decks are great for straightforward, aggressive strategies
It allows you to set up some pretty unpleasant one-hit kills, if you have the right set up
On the other hand, planeswalkers are super popular, and the twist of being playable as a commanders means there is likely to be even more casual demand for these cards than some "normal" planeswalkers or past commander set mythics
Rhinos Rampage is potentially two permanents removed for just one mana, which in my books is great value
Its one of the rarest types of errors you can find and a true collectors trophy