It's good for a board wipe, because it makes the creature indestructible
Ensuring that players will want to keep track of their Ring-Bearer by using creatures with low power thatll break through enemy defences, in the long run, is an ingenious solution to this problem
It is generally bad at getting things back
While there may be other planeswalkers with more impactful abilities, Sorin's versatility in providing lifelink, direct damage, and creature recursion makes him a solid choice for decks looking to grind out value over the course of a game
Effectively searching card text can be a little tricky and is much easier with a little understanding of how cards are worded
This is a pretty nice effect, allowing you to take advantage of your draw step to play more sorceries and creatures