Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to an Angel you control may become lethal if Lyra leaves the battlefield during that turn
By then, gaining life was acknowledged to be a pretty meh effect, and the notion of exchanging life for resources was really starting to take off
This makes it narrow but it doesn't make it all that much worse
Sadly, the egg side of the creature doesn't share the Horror subtype
Values on Mercari, as opposed to Ebay, are a little more consistent
There's a decent chance that they'll end up being worth a dollar or two, which might not sound like much, but when it comes to squeezing value out of sealed product, every little bit helps