Star Realms

This is a 110-card deck. There's a lot done with the space battle theme in that compact size. Players start with a hand of generic ("unaffiliated") space ships and use them to buy better ships and space stations or directly attack opponents. It's a deck building game, so you're trying to add cards to your deck to make it more powerful on each reshuffle. It's easy to learn. I found the included instruction sheet confusing, but the internet covers that flaw. I think you can make a 3-player game work with one deck with some modifications, though the rules call for multiple decks to be used when you have more than 2 players. Playing the game with two players, you need space for two player hands (5 cards + draw + discard) and a market row (5 cards + 2 draw decks + discard).