The only thing I will offer in this discussion is that, even though I maintain a Great Wall -based decklist here as a joke, I actually saw it played once in serious play
Its great if you find yourself in a bind and need a quick restart or to help you get a card you need to roll out a combo
Which other creatures do you play in toughness-matters decks, and how do you take advantage of them
Turning your spells into new creatures, and a recurring source of recasting those spells is a great value engine and is absolutely a commander worth building around
Finally, to give your opponent Forests, use cards such as Gaea's Liege and Yavimaya Dryad
A: The Sakazuki (Akainu) Manga Rare, around 500,000 JPY at the high end in early Japan trading