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Yu-Gi-Oh! Wiki

"Peten the Dark Clown", a card with an optional effect

Optional effects are effects that a player can choose whether or not to activate. Optional effects include the phrase "You can" in their card text.

Mechanics

Missing the timing

Optional effects that use the word "When" ( (とき) Toki) can miss the timing. Optional effects that use "If" ( () (あい) Baai) cannot.

SEGOC

When multiple effects trigger at the same time, they are all placed on a Chain. After the players have activated all Mandatory Effects and determined their Chain Link order, if any, the players start activating optinal effects and determine their Chain Link order, with the Turn Player doing so first.

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