Seems a bit complicated to me. I like the poison thing though - it works differently from momentum (it continues to stack, but can be purified). Although bone dragons/mummies + this would be rather OP.
I guess...Any ideas to make it less OP.
And how is it complicated.
I have an Ivory dragon out.
I use this and target it. Now instead of dealing 10 damage it deals 10 poison.
If i am Pure then my mark begins glowing.
Every turn i can use this ability for X cost which is still to be decided.