The casino offers you the software to play like Texas Holdem Poker where players play against each other and the casino gets a very minimal fee from each hand played and the fee is usually like from 0.01 to 0.10 percent. This I think will be as close as possible to the 100% theoretical RTP which you are asking here and that is because casinos operate like businesses and they are not charity. If you are not happy even with this player vs player approach I doubt you will find anything else near the 100% RTP being asked here simply because it does not exist. Well maybe there is a way and that is if you play demo mode  .