Rakdos represents some of the more impulsive, chaotic, and violent aspects of Magic
That double-faced card text is a sign that it was a common in a set full of battles and dual-sided cards that represented compleated citizens of the multiverse
I dont know for sure that being an instant would allow a card like this to see a ton of Commander play, but in a color that thrives on responsive interaction, a 5 mana sorcery speed spell better be doing something on par with giving me an extra turn or buying me some breathing room from the whole table
One of them was about a cycle of lands inspired by a card from the futureshifted sheet of Future Sight
If Roronoa Zoro - Legacy of the Master battles an opponent's Character at any point during that turn, his effect instantly sets the Leader back to active status, granting the player a second combat swing or a defensive rest-stand reset
With Ellivere handing out Virtuous Roles like Opera, its not tough to see why this ability might be a strong draw engine