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Such all-in builds are definitely what Gyruda is known for in other formats, and its not difficult to recreate in Commander with all the extra clone and flicker effects we have available

It is not uncommon to have a turn where you have extra mana and nothing to do with it, but Omnath lets you store that mana for future use

Loading a deck up with Stadium cards and building support around Roaring Moon ex sounds like a fun deck to build, that's for sure

There have been several cards in the past that produce extra mana but restrict it to 'spells/costs containing X,' but none of them have been particularly impressive