Perhaps a "Nullify X" bonus? X would be something such as "attack", "damage", or "power", and the Nullify ability would read: "Any changes to [whichever stat is affected] during the round that [the card or, in this case, clan] is played have no effect. Leader
abilities are unaffected."
I understand it's kind of an upgrade of "Protection: X" as it would stop + effects, too, but I look at it like this: Best case scenario, it's an All Stop vs. double modification of the same thing (plus an ability/bonus--rather strong, to be sure); worst case scenario, it has no effect at all, like an SoA against Lohvak, Tyd
, etc. It would, however, prevent that clan or card from changing the statistic, so it doesn't seem to be broken IMO. Thoughts?