I can give you an example of what skills are used in my setup.
I use Vega, Cleo, Jascues, Bane, Yip, Elena, Grimms, Avalon, Virion.
1. Vega Heal (because I put the reduced cooldown on her)
2. Cleo's Black Hole
3. Jascues Spray
4. Yip's Tornado
5. Grimms' reload
6. Bane's charge
7. Virion's resurrection
I don't have summon skills, but I almost sure that they are the last in any order.
Castle 40, Void - 100 all perfect
House: Icarum, Gods of War