Its a versatile Song that can be useful in a variety of different situations, but while it can hinder an opponent, theres a risk it might also allow them to draw the exact card they need
WotC had previously added non-Hasbro IP cards to various Standard legal sets, such as the Godzilla cards in Ikoria: Lair of the Behemoths (see "'Spacegodzilla, Death Corona'") and the Jurassic Park cards to The Lost Caverns of Ixalan (see "'The Lost Caverns of Ixalan'")
Tetsuya Nomura's comments about a Safer Sephiroth card he designed have many convinced that's what the villain's final form will look like in Remake Part 3, and Tifa's Secret Rendezvous card suggests her date with Cloud at the Gold Saucer is the canon option
They do stack exponentially, of course
One of that set's best mechanics is Void, which checks at the end of your turn to see if a permanent left the battlefield (like if a creature died)
When a card is put onto the playing field, by using ink, its ink is not dry, and you cannot activate its powers immediately