オンステージ！ レム is a Weiß Schwarz card from 「Re:ゼロから始める異世界生活」Vol.4 RZ/S132-079. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【CONT】 If you have 4 or more Red or 《Magic》 or 《Weapon》 characters, this gets -1 Level in hand. 【AUTO】 When this is placed on stage from hand, send up to 1 card from the bottom of your Clock to Waiting Room, and this turn, this gets +4500 power. 【AUTO】 [(1) Discard 2 characters] When this card's battle opponent is Reversed, you may pay cost. If you do, send that battling opponent to Clock, then choose up to 1 card in your opponent's Waiting Room, place it on top of their deck.
This card was printed in Japanese only; the English text above is an unofficial community translation.