Wishposh, the Giant Beaver

Whenever you cast Whishposh, the Giant Beaver,
each player mills X cards.
Whenever Whishposh deals combat damage to a player, that player must choose one-
• Draw two cards, mill three cards.
• Sacrifice three creatures, gain control of
Whishposh and put a +1/+1 counter on it.
• Mill ten cards, return Wishposh to it's owner's command zone.