The biggest is that it just doesnt have the mana rocks you want to see in a Commander deck
Ultimecia is a beefy 7/7 with Menace, which can finish your opponent off in just three swings if they lack good blockers
Raul, Trouble Shooter Raul, Trouble Shooter isnt flashy but provides good, solid value
Menace vs Double Strike Menace doesnt have any special interactions with double strike
For simplicity's sake, I'm representing these in a bullet-point format, but if you're looking for additional effects to round out your lists with some variety, you should consider some of these
The common and uncommon removal spells dont force us into color combinations, theyre all splashable, and were still valuing lands extremely highly