3/2-2-2 mulligans (depending on coin flip).
Extra mulligans if you have over 7 cards at the begining of the round.
If you pass with more than 7 cards, the extra cards are not destoyed, but not drawn.
Max provision cap 150 + Leader (leaders provide extra provisions).
Certain fixes to cards: Sihil coldown to 2, Letho temporarily removed, for example.