Miraculous Phyrexian Toxin

Enchant Poison Counter(s)
If you would lose the game due to gaining 10 Poison counters, you can cast this from your hand as if it had Flash for only {p/b}{p/b} (If paid with life, it cannot be countered.)
For the rest of the game, even if this Enchantment would leave the field, the required Poison Counters to make a player lose the game becomes 50.

During your upkeep, you gain 2 Life for each Poison Counter then lose 1 Life for each afterwards.
Whenever a Poison Counter gets proliferated, it