1 to 10 - Any 3 Star. I start with my r3s and go down. 11 to 13 - Lowest 3 Stars. I start with my lowest guys and go up. 14 to 20 - 4/40 or 3/30 Champions. I start with my 4/40s and work my way down. 21 & Above - By this time I'm able to use the rest of my 3/30s and my maxed out 3 Star Champions. Then I just use all my 4 Stars and maxed out 3 Stars.