On TCGPlayer , the Enchanted Yen Sid - Powerful Sorcerer is valued at $295
That being said, I think the reasons for a card being banned can be broken down into two main categories: A card is too powerful on its own and almost every deck has to have it to be good
So, the story starts out here as a reference to The Fly , where Jeff Goldblums character turns to experimenting on himself in a similar manner and ends up turning himself into a horrifying human insect hybrid
This builds on the strategies outlined in retargeting campaigns
Pyretic Ritual ($13.03) Pyretic Ritual is high in demand for storm decks, and its more top of mind given the influx for storm stuff after Ral, Monsoon Mages Modern Horizons 3 printing
You obviously want the best but the step down from the best to the others that you will see in cubes (provided they are two or less mana) are fine