25th anniversary yugioh booster boxes Yu-Gi-Oh! Trading Cards: Legendary Collection Box : Toys & Games retrieving%20Dark%20Magician%20of%20Chaos%20joined%20them%20thanks%20to%20the%20incredibly%20powerful%20Dimension%20Fusion%20Spell%20Card YuGiOh Battles of Legend Monstrous

to add Valk from the Deck

Each card has been printed using a foil process unique to the From the Vault series

Interestingly, this isnt the first time weve seen Magic: The Gathering leaks like this

By detaching an Xyz Material from Number 33: Chronomaly Machu Mech as a cost, the controller can inflict damage to the opponent equal to the difference between the original and current ATKs of a monster the latter controls, then Machu Mech gains ATK equal to the damage inflicted

While it can grant you two extra combat steps for five mana, its by no means the default choice for this effect

Trainers and Energies on the other hand has x numbers specific to card types