I love four Ace routines and this one looks very fair, and its also very easy to do.
You'll love it! ;)
Video
Performance
Ask spectator(s) to select four cards in very fair way - deal three selections on the table - then reveal that they selected three Aces!
Then spread the deck - missing Ace is the only card reversed!
Setup
From top of the deck: Two Aces face down, two random cards face up and then two Aces face up.
Tutorial
Optionally perform several false cuts and shuffles
Ask up to three spectators to select cards - riffle thru the deck and let each spectator stop you
Once any spectator stop you, take all cards above, turn them over and place them on top - spread the deck and take the first face down card and place above cards on the table
Continue till you have three cards selected
Reveal cards on the table (Aces) and then spread the deck to find the missing Ace ;)