I'm surprised at the resentment over this powerful card,
White is arguably the strongest color in the game.
Mafdet passive at 2.5x is significantly better than Priestess of Lights 2x it's not worth even bothering to compare the two as leaders.
It's active ability is also extremely useful, as a mono white team we'll now be able to tank big blasts from RB's and other bosses.
Mafdet leader, gretel, Kirin, faith (or white rb), white pino, mafdet helper. I'll be able to solo lvl 70 raid bosses with almost a 100% success (no revs), also will be able to steam roll past almost any advanced, regular, or time limited maps.
Also judging by the early guild war scores, this war is going to be a success for Playmage.