Nightmare of the 1002nd Night

Split second

Players must leave the game in progress as it is and play a subgame of "Yu-Gi-Oh" using either "Starter Deck: Yugi" or "Starter Deck: Kaiba".
The winner of the subgame creates an emblem with "For the rest of the game you may cast spells as if they have an converted mana cost of {0}"