Thunderstone- A deck building game where you have to compete with other players to build a deck capable of gaining the most victory points
Ascension- In some ways similar to Thunderstone, but streamlined to a mere 3 game mechanics
Nightfall- While I hate it's theme, I love the everyone plays on everyone's turn mechanic
Dominion- Probably my least favorite on the list, but its popularity is a lumbering juggernaut, so you will likely never want for more players to play it
Quarriors!- Not a deck/card game, but similar in its mechanic, you buy dice that represent creatures and spells to get enough points to win the game, lots of fun there
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