Lichs Mastery Lich's Mastery costs a whopping 6 mana, and while its in play you cant lose, period
However, a graded 10 Pokmon Rumble Mewtwo card has recently sold for $500 at auction, according to PSA sales data
Thats because trampling over with big numbers is part and parcel of being in green, and because generally green has plenty of redundant effects and redundant win conditions, so the support cards are way more important
This can just sit around and make mana for you early, and then when you get to the later part of the game you can start sending it after your opponent with all your extra mana
And while protection from white is circumstantial, most Commander games will have at least one player with white mana in their deck, so that protection is rarely totally dead
Elves in cube is somewhere between a storm deck and a ramp deck, it is weaker than storm because mass removal is brutal for it and most things will interact and disrupt it