Takeuchi: Serious Mode is a Weiß Schwarz card from Mob Psycho 100 MOB/SX02-064. Compare listings from Singapore Weiß Schwarz sellers on CardJio, then jio them on WhatsApp.
【ACT】 [(1) Put this card into your waiting room] Look at up to 4 cards from the top of your deck, choose up to 1 《Esper》 or 《Claw》 character from among them, reveal it to your opponent, put it into your hand, and put the rest into your waiting room. 【ACT】 [【REST】 this card] Choose 1 of your characters, and that character gets +1000 power until end of turn.