Lastly, there are also Action and Timewarp cards. Action cards allow you to do things like steal artifacts from other players, sell them in order to hold more cards in your hand, or remove an artifact from anyone you like.
The timewarp cards are more powerful, allowing you to stop people from playing a card, look through the deck of cards to find the card you want, or remove a card from the discard pile so that you can use it again.
All in all, this is a pretty cool little game, cooler still if you like time travel. There are multiple ways to win the game, so if people keep blocking your changes to the timeline, you still have a way to win the game.