A starter deck is the ideal start because this is a ready-made deck that can be played straight out of the box
If we go by a certain commander recommendation websites stats, this hits 28/100 of the most often played commanders from the past few months, among them high value targets such as Breya, Chulane, Jhoira, Jodah, Kinnan, Winota, Sisay, Zur and several others
Red Unless were adding flash to the package, we wont be creating all that many Treasure tokens via Gloin
Furthermore, simply telling players to ignore that until your next turn is much, much more intuitive than explaining the vagaries of flickering, and there are very few situations where phasing effects need any more thought than that
Against: As far as offensive Legendary Creatures go, Urza, Lord High Artificer is fine
When the time counters run out, you end up with a beefy 9/7 for your troubles