At roughly 1 SP per 12 boxes and six different SP types, targeting a specific SP like Nami means roughly 1 in 72 boxes similar odds to the Manga Rare itself
If you ran enough of them, it may even be able to change the tenor of the deck slightly, like running more Pact of Negation or other choices
Akromas Will FINAL FANTASY: Through the Ages, Mythic Limited: 4.0 Either mode on Blessing of the Oracle (Akromas Will) is capable of ending the game with ease, and Ive already been on the receiving end of flying and double strike
The game treats it as a spell until it resolves, gets countered, or otherwise leaves the stack
For example, if a creature is wearing a hat in its art, it's still wearing a hat, even if you cover the hat with a sticker
Its possible Wizards creates a new mechanic or two thats befitting of Middle-earth, but I think its likely we see returning mechanics, for the most part