“八星魔王”
“Octagram” is a Weiß Schwarz card from 転生したらスライムだった件 Vol.3 TSK/S101-071. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
If you have 2 or less 《Demon Lord》 characters, this card cannot be played from your hand. Choose up to 2 characters in your waiting room, return them to your hand, choose 1 card in your hand, and put it into your waiting room.