Eagle's Eye does only require one element, and against creatures with 1, 2, 3, 5, 6, or 9 health, it's far more efficient on quanta. For creatures with 4, 7, 8, or 10+ health, this will perform better. I started to list all the creatures, but it was a long list on either side.
Three possibilities here:
- Shockwave-on-a-stick is just plain broken, and I should pick something else.
- The card as it stands is too easy to abuse, and some kind of cost nerf is in order.
- This isn't overpowered - just powerful but balanced.