Behind Your back Improved by Bob brown

The magician displays a large envelope containing a jumbo card as a prediction.  Ten normal playing cards are display face down. the magician gives the spectator five face-down cards and he keeps five for himself. they exchange  a card... pit their packet behind their backs, and place the exchanged cards face-up in to their face-down packets.

when the cards are spread, the two face up cards match. the jumbo prediction from the envelope matches the selections as well! when the remaining eight face-down cards are shown, they are the same value as the selections, but different color suit!