Mint here.
While the obvious strategy is hit Anvil first because of Bastion, I decided to take out Plague Rat first. Among other things, Advanced + Hammer and Shield means that Anvil’s at 2 DR, so you’re not doing any more damage to him than to Plague Rat. So I decided to take out the main threat first, and that worked well for me.
I took out the Revocorp Restrainers, but it didn’t matter because I used Offensive Transmutation round 1 to block Plague Rat’s damage, and took him out round 2. I did an early Know When to Cut Loose to ping him down to 3, and Infinite Scholar’s base power to take him out with damage boosted by the discarded cards from Know When to Cut Loose.
Everyone contributed significantly. Legacy was the most passive, doing little beyond contributing Galvanize most turns. But without that bump in damage, the other heroes would have been doing much, much less.
Stuntman did a ton of damage, mostly with No Time to Bleed. 1 point of damage isn’t much to start, but a couple of My Own Stunts and a Galvanize later, that’s 4 points of retaliation damage. Sometimes it was 3 My Own Stunts, and eventually Legacy got Inspiring Presence out. Because Stuntman’s damage was always heavily boosted, I avoided Hidden Mine. Too much friendly fire there, and there’s that self-harm from No Time To Bleed.
Ermine’s usually a huge problem, but Stuntman turned all her ongoing and equipment destruction to his advantage.
The Scholar shut down Plague Rat round 1, and took him out entirely round 2. Once Ermine was gone he put up Flesh to Iron and tanked all the damage. He’s also really good in team fights because of Grace Under Fire and Get Out of the Way, both of which did a lot of damage due to the number of villain targets. Proletariat’s clones helped with that.
Tachyon had some troubles at first, but got a timely Hypersonic Assault after Bastion was out of the picture, and did some significant hits with boosted Blitz. She ended up being the one putting out last minute blast of damage to take down Ermine and Proletariat.
Target order was Plague Rat -> Ermine -> Anvil -> Hammer -> Proletariat.