We were worried about the number of cards people would have to track and worked with great community tools like Archidekt, Moxfield, and Scryfall to make sure those sites were ready to roll out and track those immediately
If you can afford the blue mana cost of this, it pays off well by drawing when it enters or leaves, which means it can be sacrificed, blinked, or bounced to hand and net you cards out of it
Besides, Faerie Macabre gives you main deck graveyard hate, Fulminator Mage can be extremely effective in the right metagame, and Archfiend of Ifnir prevents opponents from mounting a defense against you
Similarly, you can use the affected players resources only to pay that players costs
Some of the franchises included in the first set of cards are The Lion King, Moana, Lilo and Stitch, Mickey Mouse , and Frozen , among many others
Anyway, it's a fine mechanic, I just don't really understand the logic of it