Down With The Sickness

Shroud
When Down With The Sickness enters the battlefield, put one Poison counter on each player,
and a -1/-1 counter on each creature.
At the beginning of each upkeep, every player can
pay {2}. If every player pays {2}, exile Down With
The Sickness, else put one infect counter on each player, and a -1/-1 counter on each creature.
Violently it changes, there's no turning back now...