Unit pool size

I'm just looking for a clear explanation how the number of a certain unit works. Lets say there can only 12 zeds. If I take 3, and make a single 2 star, do two get added back to the total pool? So now there could only be 11 other zeds. Or what happens when someone gets eliminated? Do their champs get added back into rotation? Just some questions I would like to know the answer to
Reportar como:
Ofensivo Spam Mau comportamento Fórum incorreto