Konami; This has two busted effects, doesn't it? Yu-gi-oh players; Yup. Which means this is the problem card. Yup. Meanwhile, you're concerned with Butterfly Dagger-Elma due to degenerate OTKs. Makes sense to me. And the easiest way to fix it is with a few "once per turn" rulings. But we need money. So limit Butterfly Dagger with an erratum and ban Halqifibrax.