A great little fun game. Yes, there's luck involved, but it's not supposed to be a game of strategic plotting, it's supposed to be fast, light filler fodder and on those counts it covers all bases. You can take it anywhere, play it anywhere and it doesn't take long.
The idea is that you try to end the round holding the highest value card. You only have 2 cards at any one time and must always discard one, playing the effect listed on the card. That might be to protect your remaining card, swap with someone else, see someone else's card, challenge another player or it might have no effect at all. There's a bit of strategy in weighing the odds of what another player is holding by what has already been played and you need a good pokerface (as well as the draw of the cards) to win.