1 of 1 is a bit weird to me, once it has been obtained (and revealed), all other sealed product should take a hit in value (no idea how this affects things in the sports market though, can someone shed some light?)
The sac ability here prevents your creatures from being blocked and protects them with a bit of hexproof
They can be flashed back with Snapcaster Mage or Lier, Disciple of the Drowned, or returned to your hand via Archaeomancer
And you can skip to the good part by just casting Green Goblin straight-up if you want to
It is a Sorcery with the Lesson subtype that costs and allows you to search your library for a Basic Land and put it into your hand, then you gain two life
You essentially try your chance to get the one card you need, and sometimes you end up with totally useless junk