Two of my last five solo games have turned out to be verses Iron Legacy at The Ruins of Atlantis. I guess my dice just like that scenario.
First game was against Visionary, Haka, and... Legacy???
Game lasted 14 rounds and ended with a hero victory with no heroes incapacitated. Game keyed (IMO) on Legacy getting Next Evolution and Lead From the Front in play early on - which negated most of Iron Legacy's attacks and granted the team time to removing IL's ongoing cards and prepare for a heavy onslaught to take him down.
I initially thought the team might be a little firepower light to deal with Iron Legacy. But once it looked like the game was going to stretch out that allowed for some preparation. Visionary had a few one-shots saved up; Haka had Rampage cards; and Legacy some one-shots as well in addition to Inspiring Presence in play. And Legacy's non-melee attacks had been taken care of by a Twist The Ether play.
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Second game was against Ra, Unity, and Absolute Zero
Game lasted 4 rounds. Iron Legacy started with Galvanized, Galvanized, and Demoralizing Presence for +3 Damage inflicted and just pounded on the heroes. A second Demorlizing Presence appeared in Round 3. The Environment joined the fun by playing two Kraken tentacles and a Collapsing Hallway to speed the process.
I thought the second game was going to be trouble just based on the hero selection. Two that needed fairly good draws to get started. And IL's front-side EoT attack was going to be very hard on Unity's bots. (In fact, once the Kraken started coming out I think the best strategy for the team was getting IL on his flip-side and go all-out ASAP. Stop the AoE attack and also get IL potentially be the Kraken target.) One IL's ongoings were drawn I figured it would be a short game since he would just roll out so much damage and the heroes in question could not win a fast slugfest.
And the heroes did not have bad initial draws. Unity had a Pylon and a few bots (cryo and raptor); Ra had a Staff, and a few good one-shots; and AZ had his basic modules on hand - though an Impale and a Fueled Freeze might have been better for this sort of contest.
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So, given the experiences above, what would probably be the worst three hero team to face Iron Legacy with?
I figure a trio of "support" heroes might lack the firepower to deal with IL and run his HP down fast enough. And the trio of Bunker, AZ, and Unity would probably just not be able to build up fast enough to handle him.