Merlin: Miscalculation is a Weiß Schwarz card from The Seven Deadly Sins: Revival of The Commandments SDS/SX05-061. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【ACT】 [Put 2 cards from your hand into your waiting room & 【REST】 this card] Draw 2 cards. 【ACT】 [【REST】 this card] Choose 1 of your characters, and that character gets the following ability until the end of your opponent's next turn. "【AUTO】 At the beginning of your opponent's attack phase, you may choose this card and 1 of your 《Britannia》 characters, and exchange them as 【STAND】."