Fangs of the Black Wolf (MTI/S83-E075 U) [Mushoku Tensei: Jobless Reincarnation]

If you do not have a "Six-Sided World" character, this card cannot be played from your hand. Choose 1 "Six-Sided World" character in your waiting room, and return it to your hand. Choose 1 of your characters, and that character gets +1000 power and the following ability until end of turn. "[AUTO] When this card's battle opponent becomes [REVERSE], you may put the top card of your deck into your stock."