I like the idea , but isn't the card a bit expensive ? Poison deals 2 damage per turn for 1 and this card deals 1 damage per turn for 3 .
There is the chance of silence ( i think 40% would be better because you can't really rely on a 20 % silence chance ) but still i think 2 would be better.
Yes Poison is a lot stronger in terms of damage when compared to this, but I intended to make it weaker with a supplement effect, which will hopefully create synergies with other cards in a deck. I will put up a poll for the cost though.
Psion/SoW damage is consider as thunder damage too?
umm no. Those are spell damage, like Firebolt or Lightning. Thunder damage is a status damage, like Poison. Maybe I should change the name of "Thunder damage" to something like..."Shock damage" maybe?