Nissa, Resurgent Animist is so powerful that it may become a staple in a Modern archetype
First introduced in 2021, Universes Beyond features intellectual property from outside the traditional Magic Multiverse, swapping characters like Jace Beleren and the Phyrexians for Stranger Things Eleven, Hatsune Miku, and Warhammer 40,000s Space Marines
While this is a widely regarded truth within MTG, it does beg the question, which green card is best
His best home is a Golgari Recurring Nightmare style deck where you have ramp and discard outlets to stop him being a liability in your hand
(Remember that the rules for ninjutsu specify that a creature that enters the battlefield attacking because of a ninjutsu ability attacks the same player or planeswalker the returned unblocked creature was.) Although the token is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example)
Maybe a third party company makes it and anyone can use it