Ok, since I was "that guy" I'll play devil's advocate on this one. Putting the wording issue aside, which I do agree can be confusing, I think Agent of Death is a worthwhile card.
Let's start with the fact that is a 3 domain 7 flux card. This guy ain't cheap, and he's an end game character. In many games he simply won't make it out to the field.
Second, every race has a counter to omg-crazy creatures. Lyssis, Ascent, Negate. Some are better than others, but they're all there. Is it luck of the draw that you have one in your hand? Absolutely. This whole game is luck of the draw. The point is that there exist quick fixes to the Agent.
Third, he kills your own units as well. Half of using the Agent on the battlefield is keeping him away from your own units. I accidentally killed one of my own guys by moving him near the Agent. Since he'll typically be played in a Dark Legion deck, having him not kill the undead may actually be too much of a boost to the owner because it takes that countervailing force away.
In the end, he's only got 7hp. You can't melee him, but there are so many other things to do. Entangle him (which can't even be done to aloft creatures), put him in ice, direct damage, whathave you.
Zycomancer wrote:
Anyway he singlehandedly turned the tide of a game on me
I'm not sure that's a problem. So many cards have that much power. I think for something that expensive, it better do some tide turning damn quick.