Theres nothing truly revolutionary about this modular approach (swapping Commander precons to use other Legendary Creatures within them as their leader is part of the fun of the format), but having five options for Turtles means that no one is left behind
There are many Demons with powerful effects you can easily curve into so you won't be burning yourself out of the game
Brudiclad, Telchor Engineer Brudiclad, Telchor Engineer is a token-creating, token-changing, haste-enabling beast
Target creature gets +2/+2 and gains indestructible until end of turn
The Magic card Aerith Rescue Mission encapsulates that choice perfectly: you can either take the elevator, giving you three 1/1 Hero Tokens (representing Cloud, Tifa, and Barrett being ready to fight), or you can take the stairs, which lets you tap and stun up to three creatures (representing their cardio-induced duress)