If you build your Commander deck right, you probably won't be using that fourth ability very often
Two years ago, a deck that was very dominant in the competitive scene was the Brilliant Monarchs deck and apparently this card found a spot there to shine as the Deck was in need of a level 5, light vanilla monster that was preferably fairy (because of some Darklord shenanigans that you could face)
These were a little more divisive than the other alternate art cards: some players adore them, whereas others dont quite vibe with them
Sephiroth, Fallen Hero sets your modified creatures to beefy 7/5s at base when he swings, which is fantastic if you manage to go wide
The problem goes further than that though
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