pokemon secret rare cards How to Tell the Rarity of a Pokémon Card Photos are ours of our stock. Secret card (TCG) - Bulbapedia,

I was quite surprised

Louis Cardinals 90ASC-39 Cal Ripken Jr., Baltimore Orioles 90ASC-40 Gunnar Henderson, Baltimore Orioles 90ASC-41 Babe Ruth, New York Yankees 90ASC-42 Hideo Nomo, Los Angeles Dodgers 90ASC-43 Mickey Mantle, New York Yankees 90ASC-44 Manny Machado, San Diego Padres 90ASC-45 Jarren Duran, Boston Red Sox 90ASC-46 Sandy Koufax, Los Angeles Dodgers 90ASC-47 Shota Imanaga, Chicago Cubs 90ASC-48 Julio Rodrguez, Seattle Mariners 90ASC-49 Vladimir Guerrero Jr., Toronto Blue Jays 90ASC-50 Bobby Witt Jr., Kansas City Royals Fanatics Authentic Redemption Cards Fanatics Box Exclusive 30 cards Paul Skenes, Pittsburgh Pirates Fernando Tatis Jr., San Diego Padres Trea Turner, Philadelphia Phillies Luis Severino, Athletics Juan Soto, New York Mets Aaron Judge, New York Yankees Mike Yastrzemski, San Francisco Giants Ken Griffey Jr., Seattle Mariners Dylan Crews, Washington Nationals Bobby Witt Jr., Kansas City Royals Max Scherzer, Toronto Blue Jays Wyatt Langford, Texas Rangers Ozzie Smith, St

Therefore, if you've got a Deck of 40 cards, around 20 should be Monster Cards

Only if you believe the card is worth $100+ in raw condition AND you think it will grade PSA 9 or 10

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