Since it costs only two mana, I think it's a solid one-of inclusion in the Primeval Titan deck
Selesnya Offense broke out during the final weekend of Standard Regional Championships in May, where it posted an impressive win rate against the field
After rushing our Scion onto the field, wed use its activated ability to clone Mana-Charged Dragon, then dump all our multicolor mana into its effect to punch someone for a ton of commander damage
It's especially good at keeping up with the increasing mana costs of your Spirit or Demon commander
"Magic: The Gathering's Turtle Team-Up Is Part Co-Op Clash, Part Magic Tutorial"
Of course, there's some history and more to unpack there, so we'll leave the discussion for why Commander is called EDH for next time, for today, think of them as the same thing