I definitely understand what you're saying, and if this was a pure
card (like the original idea that I'd come up with before), then I would agree. As it is, it's going to be a somewhat harder card to use, and the type of deck it could be used in is going to be limited. Given all of that, the fact that it can ONLY target immortal creatures, not regular ones, and that it is an easily killed or altered creature, I went with the option of allowing it to target. Ideally, if you're using this to begin with, you're going to have it out soon enough to begin dealing damage before the opponent can get any real number of immortal creatures out anyway, so I don't think it would alter the balance that much anyway by making it random.