I guess the card is worth the price, this makes pure healing and defense decks finally have a chance to lash out and do some actual damage.

But, for _10 I dunno.

This is basically a 3cc card that deals 4 UNPREVENTABLE damage, at instant speed, without any drawbacks! In MtG this card can fetch up a VERY high price, (Remember Urza's Rage anyone_)

The 4 damage prevention is just an uncalled bonus to an already powerful card. The only 'drawback' is that this is only available to a supposedly passive class, not meant to do things aggressively.