Board Thread:Questions and Answers/@comment-26293506-20150613004256/@comment-12.203.250.162-20150619163745

I always used Magneto as the third. His purple allowed ready access to Widow's blue for delay/heal, and I could use his blue to clear the board on the days the ninjas appeared. His red also makes a good substitue for Thor's red, which is relatively weak.

Storm's blue is compelling, but if you're spending it all on OBW delaying enemy countdowns you're not going to have more than one to deal with the hero rounds, and her green, while useful, drains Thor's best takedown.

That combo leaves you without an active black. Ms. Marvel's delayed damage is not a good fit for hero rounds unless you have stun capability, so at 2* Johnny's black is really your only option and it's not that useful in this context. It expedites progression to your next round, preventing you from collecting more AP. Ideally you want to destroy the hero teams before they get a chance to act, meaning you need as much of Thor's colors as possible.