Swap Beast

In Swap Beast you have a team of creatures that you choose when to send each in to a series of 1v1 fights. They fight automatically so your input is the strategy and between battle upgrades. 

The key mechanic is swapping. Whenever a beast is defeated you have the choice of who to send in. There is an extra layer of can your beast win the fight or maybe you are trying to weaken the enemy enough to trigger a passive, then send in a sweeper.