Wouldn't double poison straight out kill target creature next turn unless it has healing backup or only 1 doubled to 2 poison? The effect better be worth it.
relevant link: http://elementscommunity.org/forum/index.php/topic,10924.0.htmlPS: This card has been hinted to be on Zanz's to add list.
I think this effect might be more akin to the purifying nature of the river.Purifying pain : Target creature takes 2 damage and gains +1|+1. [Estimated Value 1-2? 3?]or : Target creature takes 4 damage and gains +2|+2. [Estimated Value 1-2? 3?]This will increase the power and health of a creature but requires healing.