Watercolor

From BoardGameGeek:

Watercolor is a game of gentle oneupsmanship. Two players will play higher and higher numbers in hopes of being the first to run out of cards in their hand and collect a Prize card. Players will use digit cards to compose their numbers (for instance, a 5 and a 3 can make a 53 or 35). Every time a player plays a number, they'll have to take a card that was already on the table into their hand, which means their best-laid plans will oft go astray in dynamic and exciting ways. Players will get a new Skill card each round, and can use them to disrupt their opponent or buttress their own plans. The first player to collect two prize cards wins the game.