Thunder Emperor Sun Dragon, Bal Dragon

■ [Act] Choose ＜Darkness Dragon World＞ or ＜Star Dragon World＞. For this turn, this card's world name on the field is also regarded as the chosen world name. You may only use this ability once per turn.

■ Counter [Act] During your attack phase, choose a card on your field, and you may return this card from the field to hand. If you do, the chosen card.

■ Penetrate