I think this is a good card. It isn't OP, it levels the playing field. Sometimes (i guess 50% of the time), it won't worth playing it, in those cases it is dead weight. In other cases, it will cut the game short based on current creature standing.
An extreme anti-stall/anti-spell card. I can imagine using this in the same deck as fractal.
The first line is redundant. We don't need to have it just for the sake every color has one card with that line in it.