Koenma

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.

Trigger

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.