I am way behind on the Gladiator cards due to not being in an active guild for a while. Now that I am in one I'll hopefully have some of these cards maxed so I can burn extras and try getting those GFL.
I would recommend that, with survival mode, it is likely better just to accumulate extra copies of RF glads levels up to certain levels, especially for powerful commons like katrelba and vorst + captain katie!
Yeah I have noticed them smacking around my bot a bit in survival. I'll definitely have to do that.