The life total changes for a player only when it enters under that player's control
I could maybe see this one getting included in some D&T lists depending on how the meta shakes out, since this is good against Snapcaster type effects (even then, it seems like a stretch)
Standard has a very big midrange and tempo meta, with tri-color midrange decks dominating
However, if you can fill your graveyard with creatures and get to eight mana, this thing can get huge
All in all it seems that Modern Horizons 2 will be injecting a well needed breath of fresh air into the format and a lot of new and exciting innovations are already taking place in these very early stages of this refreshingly new format
With multiple cards in the deck to retrieve and attach Energy from the discard pile, Radiant Greninja helps generate value and activate your cards to attach more Energy to your Pokmon