Miss Match

From BoardGameGeek:

Miss Match is a very simple massive multiplayer card game for larger parties, events, and conventions. Players start with an equal number of Miss Match cards each (at least 1) and face off in quick 1 vs 1 games. The winner, determined by a couple of card flips, will take up to as many cards as they played from their opponent (while keeping any cards they played). The player with the most cards at the end of the event wins the whole game. But players don't know how many cards are in the pool, how many cards other players have, or how many cards to play against each opponent. The game can be played in-hand, in less than a minute, while standing or waiting. It's an ideal ice breaker game with player choice, luck, and exciting tie breakers. All the rules are on the card. Miss Match is distributed as a Forever Free Print and Play Game for personal use. -description from the designer