Clones that grant themselves Flying are always great
They have changed the face of the game, redefining constructed formats from casual to competitive
The beloved MTG Commander Omnath finally gets his fifth colour, becoming a Phyrexian in the process: Omnath, Locus of All has an interesting take on ramp and card draw Our favourite dino, Etali, also has a Compleated card - though her basic form is so powerful you rarely need to flip her to win a game
Control Magic effects and threaten effects like Act of Treason can steal commanders as well
Although token creatures won't get a bonus from Mirror Box's last ability, tokens that are copies of nontoken creatures improve the bonus those creatures get
It is very hard for your opponents to interact with, as most of your spells will have split second thanks to Shadow's chaos control ability