If it has neither, create a Food token
Unlike other sources of ramp, like creatures or artifacts that tap for mana, lands are very difficult to remove from the battlefield, and unlike temporary ramp, like Dark Ritual, extra lands continue to provide an advantage turn after turn
Green doesnt hurt for mana production, meaning you could reasonably activate this effect earlier than turn six
The CMC restriction ensures that he doesnt scale too well to Commander, and only triggering off of legends, artifacts and sagas means that its really hard to build around triggering his ability consistently while also having relevant creatures to return
but because all of them have very different playstyles that'll suit different kinds of person, it pays to get a heads-up on what they can do before making a decision
Not only was this combo extremely powerful, but actually executing it on MTG Arena would be very click intensive and time consuming