Draxis, The Dragon Broodmother

Draxis, The Dragon Broodmother cannot leave
the battlefield as long as there is a Broodling on
the battlefield.
When Draxis, The Dragon Broodmother leaves
the battlefield, each player wins the game.
If Draxis, The Dragon Broodmother would be
dealt damage, instead put that many -1/-1
counters on Draxis, The Dragon Broodmother.
Whenever a Broodling leaves the battlefield,
remove 2 -1/-1 counters from Draxis, The
Dragon Broodmother.