There are a lot of fun spells that you can run with Edgin as your commander, cards like Wild-Magic Sorcerer which give the first spell you cast from exile cascade, cycling through your library until you find a spell that costs less than the initial spell.
Its got a great pair of Attacks including the excellent Hydro Lander, which costs just one Fighting Energy to use, yet does 160 HP of Damage and allows you to grab up to three Fighting Energy cards from your discard pile, then add them to your Benched Pokemon in any way you like
Roaming Throne (Replacing Electric Seaweed) In a deck built around specific creature types, Turtles, Ninjas, and Mutants, there is no greater support piece than Roaming Throne
For a 3-mana investment you can get two of something, whether its a utility creature, a game-ending threat or simply doubling up on interaction