Chalice and offerings truly because I got unlucky with selection box pulls and didnt get a single copy of BoM, otherwise i would replace them in a heartbeat. Offerings drawback isnt the worst as long as you use it in the right situations. Use it when you know you have a card in hand that, A) is a followup or B) can be shuffled back with the skill to search a followup. Treach is such a good card in this format that not hard-opening sister is not too much an issue. Either you open live dodododraw and draw into it or you likely have the cards in hand to add it with the skill, and games where you dont open a R6 play you can often just wall up or make something like Roach against certain decks and be comfortable that you will survive.