There is some sort of pattern in cards below. Simply figure out what the next card should be.
Note: You cannot re-use a card already in play.
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It appears that
Every line of three cards that pass through the Jack of Hearts in the center tallies to 21. Therefore the missing card is an Ace.
One of the cross rows has 2 hearts and a club...so maybe this diagonal does too?
The missing card is the Ace (of Hearts?)