"There are 25 exclusive trading cards to discover, and for the first time ever customers will receive four cards with each Happy Meal purchase," McDonald's said in a statement
This means either having Teferi, Mage of Zhalfir or token creators like Mobilization
13.4 If an unsold Lot is not collected by the Seller or sold by the Company within 28 days after the Sale and after the Company has given to the Seller 7 days' notice to arrange for its collection, then the Seller authorises the Company to dispose of the unsold Lot by public auction without reserve and to deduct from the Sale receipts all monies owing by the Seller to the Company
After some months of testing though, it quickly become a frequently played mainstay in the format, and I already have in a lot of maindecks/sideboard of my decks
Standard cards (common or uncommon) are the lightest while holographic cards and full-art cards are heavier because of the extra layers of material
Certain cards will grant energy counters which you can then spend for effects ranging from damage to buffs to card draw