I kinda like that. A single image with clear numbers, and green usually represents healing. If it's poison, I tend to see it in a different shade. It does require the basic knowledge of what those numbers are, but on a Video Game trope, that much can be assumed to be common knowledge.
+1 for "the last suggestion looks too close to Your Soul Is Mine".
...that brings the question - would it work better on that page? The pic on there seems more like soul destruction than soul stealing.
I don't like it. Two differently-colored numbers? The entire message is "an attack that damages your opponent and heals you", which is communicated clearly by those words. It is not communicated clearly by that image.
Becky: Who are you? The Mysterious Stranger: An angel. Huck: What's your name? The Mysterious Stranger: Satan.