Parts on some cards Strength: Strength appears inside of a sun symbol on the right side of the card and shows how much damage it can deal
Starting Place: Bounce White was the first place I looked in the design space, especially because of: These guys let you recycle ETB effects and take bodies off the board, reducing the midrange feeling
So for Brago, King Eternal and decks like that, or guardian infinite combos, or even just to throw into Derevi for value, this is a neat ability
Apart from mutate cards to trigger that ability, I guess you could use Stuffy Doll and Brash Taunter, or fill your deck with cards that grant abilities to your commander like backgrounds and the legendary familiars (Kediss, Falthis, et al)
Players that are new to the game should be able to find interesting upgrade options just by looking through their decks
While this version of the mana curve is useful, it isn't a rule of deck building