Zenith Plesioth

Extreme Waterblight, Dive
Whenever you draw a card each opponent mills 6
cards.
Whenever a creature with the creature type
Zenith enters the battlefield under your control
or leaves the battlefield, mill half of target players
library rounded up, then draw 4 cards.
{4}{u}{u}{u}: Draw 7 cards, you have no maximum
hand size for the rest of the game.