This was an insane corporate freebie, as it was created to celebrate his 60th birthday and handed out exclusively to employees who attended the event
You can't go turn five Oath and pray that (a) you've got something in hand to play on the next turn, and (b) that you'll be able to do anything with it anyway
The pump-up effect isn't from the "the Melodious Diva" monster, but from a Fairy monster, which is plain but nice
youre mainly interested in your creatures, and there will be plenty of spare lands and other spells to exile
If that creature loses all its abilities, it will still be exiled at the beginning of the end step, and if it would leave the battlefield, it is still exiled instead.
The creature roots itself into Lake Ashino, where it begins calling out to its progenitor Godzilla