Summoners, we are aware of an issue where the Summoner Sigil's Golden Circle Quest is not available to all players. We are continuing to investigate this. We will be sure to compensate for any missed Gold once we have fixed the issue.
The Masterminds Lv. 3 synergy says, “All champions gain +20% Energy Damage once a Combo of 15 or more hits is reached.” However Magneto is only doing 10% more damage after 15 hits. Tested with 6* Magneto (Marvel NOW!).