王となる決意 is a Weiß Schwarz card from チェインクロニクル ～ヘクセイタスの閃～ CC/S48-097. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
Choose 2 of your Characters, REST them. If 2 became REST, draw 1 card, all your 《マナ》 Characters, during this turn, get +2000 Power.
This card was printed in Japanese only; the English text above is an unofficial community translation.