Zayden, Sesquipedalian

At the beginning of your post combat main phase Zayden, Sesquipedalian deals damage to each creature and to each player equal to the amount of damage dealt to all of them this turn added up and then divided by the amount of creatures you dealt damage to. Rounded down.
Each time an opponent draws a card, they loose life equal to the converted mana value of that card divided by the number of cards this turn minus the first and second card they drew. Rounded up. This can only trigger up to four times a game