So long as you have Energy counters stored up, Sphinx can singlehandedly go balistic
The one thing I'll say comes down to a similar issue with Elven Empire and Necron Dynasties : mark-ups stink
Just killing a creature and making a Rat token can be a good proposition if youre playing a rat-typal strategy, and the incidental graveyard hate is potent
Taking into account pricing history, favourability in legacy formats like Commander, and just pure flavour, these are the cards you should keep an eye out for when you visit your LGS
I also like this alongside red Commanders with menace like Syr Gwyn, Hero of Ashvale or Greven, Predator Captain
Its great to see this character from the original Throne of Eldraine trailer get printed onto a card in this set, and I think this card has the potential to buff itself significantly in the right deck