Dear mate, before starting this kind of post, you should learn a lit bit how to...play.
First, you forgot an important poison card
Second, you forgot that you can be poisoned by other mechanics too, for example poisoning a Voodoo doll with a Parasite.
Third, Purify and Heal aren't the only two cards able to counter poison.
Sanctuary, Miracle, Shard Of Gratitude, Shard of Divinity, Stone Skin and other source of healing (vampire ability - Vampires, Liquid Shadow, Vampire Stiletto), Druidic Staff (and adrenaline on a Druidic Staff), Feral Bond, etc...all these cards are very effective in countering poison.
Last but not least, often the best way to counter a damage (from any source) is...dealing more damage!