Koenma

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[During Your Turn] When a character on your field activates a "Choose one of the following" ability, you may switch this active character to resting and place one face-down card under it into your sideline. If you do, that ability becomes "Choose two of the following" instead. [When Played] [#If on the Energy Line#] Switch this character to active. [Activate: Main] [Switch to Resting] [Once Per Turn] Place the top card of your deck face down under this character.

[Color] Play one green character card with 2 or less required energy and 1 AP cost from your hand set to active onto your field.