Should you allow the following. Player A use the "my Bennies become XPs" adventure card then, Player B plays "get a card from the Discard stack" and then replays "my Bennies become XPs"?
Per the official rules:
Players may also trade cards at any time, but this must be a trade—you can never just give them away.
Each player keeps all his cards, but may only play one each game session.
A player can pull a card from the discard pile and trade it to an ally to be played. This is useful to play that double damage card twice.
If you took the Destiny's Child edge, then you can play two cards per session.
Also, we play by a house-rule of escalating bennies to play extra cards. Your first card is free to play, the 2nd card costs 1 benny, the 3rd card costs 2 bennies, etc. I'm not sure where this house rule came from, and only just learned it isn't the official rule.