It's a really undesirable outcome to add a card that shows up at that level of ubiquity
9 Nemata, Primeval Warden Graveyard shenanigans are one of the most common sources of sudden, unexpected defeat in Commander, and Nemata gives you a great way to circumvent these with his passive ability, exiling creatures under your opponent's control rather than letting them rest easy in their graves
Casting Tome Scour on turn one on the play is also the best answer to discard and opponents one mana countermagic if milling starts before they can play their first land in the game, the opponent often feels hopeless
There are only two caveats: the Retreat Cost of two and the attack cost of three Psychic Energy
Ive only played for an hour on my lunch break, but so far, it has been a ton of fun, and the app has a lot more polish than the existing mobile Pokmon Trading Card Game
Champion is just a good use of three mana in a generic sense