japanese yugioh card back 200 Pack Sleeve Compatible with Yu-gi-oh Card Sleeve 62x89mm Card backing - Yugipedia

Regardless, I'm curious if McDonald's will address this in any way

The other sourceless spoiler card is called Cataclysmic Gearhulk, which appears to be a part of a cycle with Verdurous Gearhulk (credit for Cataclysmic Gearhulk's translation goes to reddit user il-Vec)

We had done some (decidedly unscientific) testing with it, which we even made mention of in the June 2012 announcement

I expect it to be one of the cards that slowly creeps up in utility as people remember that it exists and eventually becomes as integral to the format as Llanowar Elves is now

Theres a few shades of aggro decks in Explorer and Pioneer running the card, and Standard Jeskai Control can as well