Balerion, The Golden King

Balerion, The Golden King enters the battlefield tapped.
Whenever Balerion deals combat damage,
untap all your lands
and return balerion to its owners hand.
Whenever Balerion deals combat damage, put a
golden doom counter on a permenant, if a player
owns 3 permanents with
golden doom counters on them, that player loses
the game.