I have been playing the Faceless Menace morph based commander deck quite a bit in my local group of friends. We are totally kitchen table magic players, but we have been playing for quite a long time so we own some older quite powerful cards. I'm looking for things I could swap out to make the deck more powerful without being too oppressive. In particular, the mana base of that deck feels like a mess. Any ideas on how to rebuild the lands and accelerants of that deck to be better?
Trim as you see fit based on price/availability, but try to keep accelerants under 3 cmc when possible as you want to be casting Kadena on turn 3. Signets, Talismans, and weaker Rampant Growth effects are fine swaps for expensive things like Three Visits. If your meta is wrath-heavy the green-producing mana dorks can be cut for more of the rocks/sorceries, but 1-mana dorks are extremely good so make the decision consciously. I'd never cut Birds/Deathrite under any circumstances.
If you need to sub lands, start with 'painlands' like Underground River followed by 'checklands' like Drowned Catacomb. Overall get as many taplands out of the deck as you can. Zagoth Triome gets a pass because it taps for all your colors and is fetchable.