The alternative commander, Kilo, Apogee Mind, can make stationing Inspirit, Flagship Vessel a breeze , since every time you tap Kilo you can propagate, adding a counter to each permanent that already has one
When he enters, he distributes -1/-1 counters, but his real power is theft
But it turns out the Hidden Ways is a polite euphemism for necromancy, and Sefris is actually far more concerned with getting huge white and black creatures into your graveyard en route to the battlefield
in addition to losing the resource of your graveyard, you wont even get triggers from payoffs like The Gitrog Monster
Kiora, Sovereign of the Deep is one of the better commanders for the monsters of the depths, collecting all the deep-sea creatures for a cascade-adjacent ability