You cant play it in Commander, but thats just because it would edge out every other viable reanimation target
X is the number of artifacts you control, and as we are all acutely aware, Commander has a bit of an artifact surplus right now, what with the renaissance of equipment and aggro decks, creature token makers, and artifact tokens
Tin-Stars should usually be depicted as protecting something, interposing themselves, using shields and longer weapons
Steel of the Godhead Steel of the Godhead gives two of the most desirable abilities youd want to give a big creature: unblockable and lifelink
Jeleva feels like a relic of a different era of Commander, where big spells were much more common and the allure of getting to use the tables spells was much more appealing