Looking for suggestions on unique commander effects/decks

As a deck maker, I hate to make two decks with similar concepts. I always look for unusual commander effects to build around because one of my favorite parts of EDH is making a deck with cards that would be bad if not for the commander. Or really just any unusual effect.

That said, I still like the deck to be playable and tend to aim for a "6-7" power if that means anything to anyone. So often an effect will be cool but there simply arent cards to support it in the needed colors.

Anyway, any suggestions are welcome!

I already have Myrkul, Magar, new Zur, Neera, Coin flip izzet, and pramikon for example.