A version inspired by the classic Reset trick. Completely impromptu, using only 8 cards to make a miracle happen in front of spectators.

With four Jacks and four Twos (four Jacks on a table and four Twos in your hand), the four Twos will turn into four Jacks, then turn back into four Twos. Entirely impromptu, only with 8 normal cards from a deck to impress your spectators.