Goat format ruling
Exodia the Forbidden One

Card effect (current official text)If you have "Right Leg of the Forbidden One", "Left Leg of the Forbidden One", "Right Arm of the Forbidden One" and "Left Arm of the Forbidden One" in addition to this card in your hand, you win the Duel.
Rulings
- If both players have all 5 of the cards listed on Exodia the Forbidden One in their hand at the same time, such as if both players start with all 5 of the cards in their opening hand, or if both players draw all 5 cards by the effect of Card Destruction, the game is declared a DRAW.
- Q: Can you declare an Exodia win in between steps of a chain? A: Basically, you're asking if the Exodia win can be declared in-between steps of a Chain, right? If so, the answer is yes. Example: Player A activates "Confiscation." In response, Player B chains by activating "Back-up Soldier." Player B has 2 pieces of Exodia (including the head) in his/her hand, and the other 3 pieces of Exodia are in his/her GY. The chain looks like this: Chain Link 1: Player A's "Confiscation" activated. Chain Link 2: Player B's "Back-up Soldier" activated. Assuming that no other cards are added to the chain, it will resolve like this: Chain Link 2 Resolution: Player B's "Back-up Soldier" resolves, and the remaining 3 pieces of Exodia are added to Player B's hand. Stop right there. All 5 pieces of Exodia are now in Player B's hand, and the win can be declared at that point, before Chain Link 1 gets the chance to resolve. The reasoning behind this is that an Exodia win CAN be declared during a Chain, after one effect resolves and before another begins. However, an Exodia win CANNOT be declared while an effect is still happening. An example is the infamous Exodia/Graceful Charity situation: You have 2 Exodia pieces in your hand along with "Graceful Charity" and nothing else. You play "Graceful Charity," and draw the last 3 pieces of Exodia. However, the win CANNOT be declared, as you must fully resolve the current effect first. However, that requires you to discard 2 cards in your hand, so the Exodia win will not happen. Steve Okegawa,
- Q: If the last piece of "Exodia the Forbidden One" is drawn from the Deck and the opponent activates "Drop Off", will the player still receive the automatic win? A: If a player draws the last piece of Exodia, that player wins before the effect of Drop Off resolves.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.