Killing Stone (WL014) [Promo Cards]

If your J/ruler isn't "Lilias Petal, Agent of Salvation" or "The Nine-Tailed Fox", this card enters your field rested unless you pay 300 life. Treat this card as a wind magic stone and a darkness magic stone. Rest: Produce G or B. When this card is put into a graveyard from your field -> Your opponent loses 100 life and you gain 100 life.