yugioh original structure decks Yu-Gi-Oh Number 29 Master Of Pendulum Deck Card Game If it is discarded to the GY Structure Deck - Yugipedia

Its a bold move to thank people for their understanding while offering no details for the drastic policy change, and saying in advance that you have nothing more to say obviously invites speculation, which leads us to a few likely possibilities

This is practically a Solemn Judgement that you dont have to pay for

Thats why I showed it to see if anyone would catch it

Light Neiroy, the Dream Mirror Disciple If a "Dream Mirror" monster(s) is on the field: You can Special Summon this card from your hand, then, you can make this card become DARK

Leave the room and then turn left, ignoring the path above you

Once per turn, when your opponent activates a card or effect while you control this Tribute Summoned monster (Quick Effect): You can take 1 "True Draco" or "True King" Continuous Trap from your Deck, and either activate it or add it to your hand