His ability is great as he wont take damage back unless you use him to challenge instead
in Magic, if you would draw from an empty deck, you lose the game
Just looking at my two Zombie decks (Gisa and Geralf Together Forever and Zombies of Tresserhorn), there are some saucy choicesamplified by the fact that theyre Zombie decks, so theres a pretty good chance that the sacrificed creature is coming back anyway
However, like any deck that wants to accelerate your Energy, you will also want to go second
You can also make Jenova itself into a game-winning threat by equipping/buffing it, where it just does an Innkeeper's Talent impression rather than sac and draw sequences
The Commander format is full of multicolored heavy hitters, and all too often, the color-identity-challenged are virtually forgotten