It's sheer aggression as well as the ability to rebuild from board wipes due to the low cost of creatures and methods of giving your creatures Haste, making it a nuisance to play against, but incredibly fun to play with
And then the Simulacrum has an enters and death trigger, so converting it into Body Double looks good you get the idea
Older Planeswalkers like Daretti, Ingenious Iconoclast or Dack Fayden had to be errata'd to make them legendary
While it can be argued that a card like Eternal Witness will often work better in some decks than Snapcaster Mage, you cant use that card to give something like Mana Drain flashback at instant speed to stop a key threat and keep you in the game
He goes by Solkanar online (chosen for his favorite card from Legends, Sol'kanar the Swamp King) and refuses to give it out during the interview, noting that "anonymity is the best protection" from would-be thieves
But there's one thing aside from financial markups and the removal of MSRP that the deck needed in order to improve