Case of the Pilfered Proof is a uncommon Enchantment — Case card from Magic: The Gathering (Murders at Karlov Manor, MKM). Current market price: $0.07.
Uncommon
Murders at Karlov Manor (MKM)
{1}{W}
Mana Value
2
Colors
W
Card Text
Whenever a Detective you control enters or is turned face up, put a +1/+1 counter on it.
To solve — You control three or more Detectives. (If unsolved, solve at the beginning of your end step.)
Solved — If one or more tokens would be created under your control, those tokens plus a Clue token are created instead. (It's an artifact with "{2}, Sacrifice this token: Draw a card.")