Team cost is somewhat irrelevant at this point in time. This is because you can field a full team of 4* heroes once you reach Player Level 10, and a full team of 5* heroes upon attaining Player Level 30. Because your maximum Team Cost increases with Player Level, it is extraordinarily rare to be held back by Team Cost itself.
See Player for more detailed information about acquiring Team Cost as you gain levels.
Team Cost by Hero Level
The table below, taken from the Hero Information page, shows the Team Cost of each level hero.
|Max Level||Team Cost|