Triss Merigold of Maribor

Whenever an opponent casts a spell, Triss Merigold of Maribor deals X damage to that player, where X is that spell's converted mana cost.
{r}{r}{r}: Triss Merigold of Maribor deals 2 damage to each creature target player controls. Do this only once each turn.
No! I will not give in and I won't be swayed! I am the "Fourteenth of the Hill"! I am not a little frightened girl from a dark Maribor Tower anymore...