Poison counters

[DoubleCapitals]

Currently, there are quite a number of cards to deal poison damage to the opponent
  Poison, Arsenic, Deathstalker*
  Voodoo Doll*
  Chrysaora
  Scorpion
  Dune Scorpion*
*Requires additional combos.

However, only one card has the power to stop the poison, which is purify. But even that cannot stop neurotoxin.
If you play against speed poison deck with a deck without purify, you would die quickly, unless you can out-rush him.
More counters to poisoning would be nice.

[Gandora]

I think SoSac and other healing cards can also be seen as counters to poison even though they don't remove it.

Poison decks often have weak creatures and much defense since they have to endure until the poison is high.
So you either need much stall with midrange to strong creatures or rush decks with some PC and/or CC.
Meaning there are more ways to win against poison even without purify.

But I get your point, poison can be really annoying... I always run my decks that I use against arena with one or two Purifies.

[Captain Scibra]

Healing cards do count as counters, as they do mitigate the effects.

[Chapuz]

Healing cards do count as counters, as they do mitigate the effects.

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nuff said.

[furballdn]

Outrush them. That's another counter. Most poison decks require at least a few turns for the poison to build up.

[Wizy]

+ Puffer Fish

I think it is fine as is, likewise every creature and weapon can deal damage, but only a few cards can prevent or heal it.
Afterall, the objetive of the game is killing the opponent before the opponent kills you, do so before the poison counter reaches a lethal amount.
Every deck has its counters. A counter to a poison deck doesn't have to necessarily contain purify.