Adding a 5 tier unit at the start of the game to help players from going the same comp every game

Each player is given a tier 5 unit at the very beginning (not deployable until level 5 or something) and is guaranteed to have a much higher chance of getting that tier 5 unit.

This will make strategizing more interesting and slightly remove some of the RNG in terms of final comp since the player must play whatever he can get in original RNG, and want to converge towards the given tier 5 after level 7.

This can also help to not have everyone going for the same comp every game.