The general assumption has been that you can only use 3* of each cyclops on the team to complete this challenge. I've heard rumblings that may not be the case, and the wording in game is a bit ambiguous.

For the loki challenge, it clearly says ONLY loki. This is not the case for Miikes Revenge.
So is the intention for it to be only 3* cyclops, or a full team that includes both 3* cyclops?