This isn’t the most powerful combo especially against multicolor decks with lots of fancy mana producers, but I’m partial to this combo in my mono green commander:

Nobody expects green to vaporize all the islands out of a deck or whatever. Big “fuck you and the horse you rode in on” energy. That whole deck is a nonsense engine, mono green but wins without attacking (mostly direct damage or milling). A lot of people don’t know how to play against it so it is especially fun to bother cocky players with expensive decks but little experience