Partly it's the interesting and experimental art styles
Sacrifice after III.) I: Urza's Saga gains " : Add ." II: Urza's Saga gains " , : Create a 0/0 colorless Construct artifact creature token with 'This creature gets +1/+1 for each artifact you control.'" III: Search your library for an artifact card with mana cost or , put it onto the battlefield, then shuffle
Y'shtola Rhul The one thing I don't like about Y'shtola is that she costs six mana, just like Edgar
There are a lot of things here to like about our good friend Ulamog
Since it's a non-Human, you can mutate Animar, Soul Of Elements, and give the creature protection from white and black, two of the colors with the most removal spells
Thats likely because right now they want people to play with (and buy) the real cards