They were so careful with the limitations they put on Protective Incantation ("Group limit 2 copies of Protective Incantation in play.") and The Chthonian Stone/The Chthonian Stone (being unique) and then they print THIS?! I can even replenish this with Uncage the Soul!
With changes like these you can really see they want the game to go in a different direction.
EDIT - explanation: I indeed think this card is too powerful, especially with interactions like Akachi Onyele and Uncage the Soul, and that is also what the direction the game moves into is: Power creep, as what happends to every expandable card game at some point. With cards like this I just think it's becoming more and more obvious.