Of course, there's some history and more to unpack there, so we'll leave the discussion for why Commander is called EDH for next time, for today, think of them as the same thing
Finally, colorless cards, such as some artifacts, do not have any colored mana requirements but still require a general amount of mana to be spent to play
For his -2, he generates a red mana for each Mountain you control
I really do adore how everythings been implemented, in the same way I loved how Dungeons & Dragons was woven into Adventures in the Forgotten Realms, but I think the power level of the set is a bit mixed when it comes to the new mechanics, despite there being some very powerful cards in Innistrad: Midnight Hunt to flashback and some good creatures and planeswalkers, too
They increase the likelihood that Saruman wont trigger each turn and that Sauron will have something to reanimate when it hits the field