The speed at which R4G/Polaris/Kate Pryde takes down teams is amazing. Kate Pryde/Polaris/Sabretooth is amazing again Polaris/R4G as well.
Other teams that I used are Wanda/Electro/Nick Fury against Juggernaut or iHulk teams.
Fun team I was trying out was Domino/Vulture/MEH. Domino and MEH sacrifice themselves to get Vulture up in the air forever. Defensively, I’ve gotten wins and losses. The idea is to let Vulture save up over 20 black aps via Domino/MEH and make opposing players retreat.