Quote from The Squirle masterAjani's Bounty should probably cost more. Seems like it would draw out games so much that you'd want to make sure it isn't competative.
Oh here we go, this discussion again. If the card takes the form of "X - Sorcery - Gain Y life", it's pretty damn hard to undercost it or overpower it. Can you think of a card in existence that follows that form and is even remotely playable?