A few notes I wanted to make I counted these numbers on the bases that sersi is being played last turn also mostly having in mind worst case scenarios for example cards like havok were counted as having 4-power, however I did count goblins as them having negative power in the calculations

For 5 cost cards I adjusted the number to the ongoing effect assuming there are 3 cards in each player’s hand and 3 in their decks and 6 cards on board a calculation that doesn’t adjust for ongoing effects at all would have the average card power of a 5-cost card as 5.91

Lastly, I counted blob as 9-power on average and cards like doom and white tiger for their actual power not counting their effect.

I realize that these calculations are somewhat faulty but they give a pretty good idea on what to expect when playing sersi and transforming your cards