
After FAQ 2.1 was published, in accordance with entry 2.23 (p. 13), the sister is no longer to deny her Crisis of Faith - it does exist, which mean a single card as an emergency button doesn't work. However, another card comes to mind for Mary's weakness, which is Tides of Fate: play it next round right after the upkeep phase, and pack yourself with some Bless-Sealing cards, the weakness is reasonable to be played around.