サマーバケーション めぐみん is a Weiß Schwarz card from 角川スニーカー文庫 Vol.2 Sks/W123-093. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【AUTO】 When this is placed on stage from hand, look at up to 3 cards from the top of your deck, choose up to 1 card among them, add it to hand, and send the rest to Waiting Room. 【AUTO】 {CX Combo} At the start of your Attack Phase, if you have "Explosion Magic" in your CX Area, and you have no other front row characters, this turn, this gets +3000 power and the following ability, "【ACT】 [(1) Discard 2 cards, Send 1 Marker underneath your {1/0 Kazuma Above} to Waiting Room] At the end of this card's attack, you may pay cost any number of times. Deal 4 damage to your opponent X times. X is equal to the number of times you paid cost +3." Explosion Magic = Set 1 Door (KS/W49-069) and reprinted as Choice (023). Also combos with Crimson Demon Megumin (KS/W49-034).
This card was printed in Japanese only; the English text above is an unofficial community translation.