yugioh shogi deck Complete Custom for Yu-Gi-Oh! Skill Cards may only be used in Speed Duel. Line Monster | Yu-Gi-Oh! Wiki

The set has some dark overtones, so it felt like it would be a good fit for one of the uncommon black battles

Special Summon 2 "Time Thief" monsters with different names from your Deck in Defense Position, except "Time Thief Regulator"

During the Main Phase, if your opponent normal or special summoned 5 or more monsters this turn, you can tribute face-up monsters on both sides of the field to special summon this card, then special summon a Primal Being Token on your opponents field with attack and defense equal to the monsters tributed

The characters in the story allude to this, but the name says otherwise

Best Red Ramp Payoffs Big Red