UR Ultra Rare Energy Drain X TRAP Target 1 face-up monster you control
The only Ritual Monsters and Ritual Spells that are Legend cards are those of the Legend series that treat themselves as such in the Graveyard
In order to get all the Promo Cards, you will have to do a lot of juggling, with some being available from Wonder Picks, others in the in-game Shop, and some are event exclusives
Well, it feels strange to ever say more than 4 of a card, but assuming we are building this cube to resemble a booster draft environment, that number could be higher
We will update this article as soon as we see more reveals throughout the coming weeks, but so far, here is the complete card list, in Japanese
Use as many Level 3 Psychic monsters in your Deck as you can to maximize the destructive potential of their Level 11 Synchro Monster