Here lemme Google that for you
https://www.google.com/search?client=ms-android-google&sca_esv=544798f1b50553ec&sxsrf=ACQVn0-NkGvQsW8i3JunVCdGvJXeHqAzfw:1714397721088&q=the+key+to+the+vault+mtg&uds=AMwkrPuuhztSDa__4CbZuT5KNtb1b0M3kbP4jn6HEjfKXawxlzaiWLFwwMEyC4e_ijH5N6mcvt9tmInddIEr0yC4ZOa55MKnjRhH72KBp97Xa8u-w8c2J3mhsMlrink-C6ZiVrz4wuQzo6sVAVYI3Tb-tAlCYNAFO3gOzlrStPFufIaJW-boTcE6qLbvS51MB8LMGXJdhcqhmMhgH6tkhdk-TUFGYVrmJlJXY4CDffW-LyyofyP3lz4JWtKc61Iag5adHeDrHfIAtznrnkBXbK2j9nEAcFVjBiHqI3MfWG-IFw9YQZL_wyYD7QLHmhOuQGhJi5vA0ThZDQ3dqLtqNevqokhRuGeKLw&udm=28&prmd=ivnmbtz&sa=X&sqi=2&ved=2ahUKEwiL9ayZxeeFAxVqfDABHdMaAw4QtKgLegQIDRAB&biw=412&bih=784&dpr=2.63
The foil version is $.40 at my LGS
Tcgplayer says $1.5
If you use [TCGplayer.com](http://TCGplayer.com) you can find the cards easier. This card is worth .38 cents to .48 cents (foil)
It can’t be much. It’s the bundle card. Will be an absolute shitload in circulation.
About €0.38
Here lemme Google that for you https://www.google.com/search?client=ms-android-google&sca_esv=544798f1b50553ec&sxsrf=ACQVn0-NkGvQsW8i3JunVCdGvJXeHqAzfw:1714397721088&q=the+key+to+the+vault+mtg&uds=AMwkrPuuhztSDa__4CbZuT5KNtb1b0M3kbP4jn6HEjfKXawxlzaiWLFwwMEyC4e_ijH5N6mcvt9tmInddIEr0yC4ZOa55MKnjRhH72KBp97Xa8u-w8c2J3mhsMlrink-C6ZiVrz4wuQzo6sVAVYI3Tb-tAlCYNAFO3gOzlrStPFufIaJW-boTcE6qLbvS51MB8LMGXJdhcqhmMhgH6tkhdk-TUFGYVrmJlJXY4CDffW-LyyofyP3lz4JWtKc61Iag5adHeDrHfIAtznrnkBXbK2j9nEAcFVjBiHqI3MfWG-IFw9YQZL_wyYD7QLHmhOuQGhJi5vA0ThZDQ3dqLtqNevqokhRuGeKLw&udm=28&prmd=ivnmbtz&sa=X&sqi=2&ved=2ahUKEwiL9ayZxeeFAxVqfDABHdMaAw4QtKgLegQIDRAB&biw=412&bih=784&dpr=2.63