Is the character deck common or individual?

In teamfight tactics you choose from a selection of 5 characters shown at the bottom of the screen. When these characters are refreshed do they come from a deck that all players take cards from? Or do they come from a seperate deck just for you?

For example if I am trying to get 9 Nidalee cards, and someone else is also trying to get her as well, is the probability that her card comes up lower for me if they already have 5 of them?

Solution 1:

It is all explained here: https://www.invenglobal.com/articles/8481/tft-champion-pool-sizes-and-probabilities-revealed

But yes your theory is correct regarding Nidalee, if two or more people are trying to get her there is a much lower chance that you will finish a level 3 due to it being a shared pool.