User blog comment:Anary Artwaltz/To the admins in here/@comment-10117350-20130806201645/@comment-9813370-20130818235041

When you make a team you start out with only up to 3 card teams. eventually you can upgrade your kingdom to have up to 5 card teams.

Having specific sets or types of cards might bolster your team output as well most examples are seen here. Simple sets can be a full team of a single rarity or single type.

Oh and as another note (though you might have found already) card weaknesses are also their strengths. Passion and Cool deal more damage against each other and the same applies for light vs dark.