You can find all the soft glow cards, including the Sagas, in Set, Draft, and Collector Boosters, in both non-foil as well as traditional foil
Giving a permanent to your opponent is generally a huge tempo loss if the action doesnt win you the game right away
A neat little detail is that this commander gives decayed to any creatures it steals, which essentially removes any intent of actually keeping your opponents things for long
(I always imagine it like being what youd get if chess had certain edge cases where rooks could fly, bishops could teleport, or for a second, pawns were driving tanks.) Since the game is built around several thousand collectible cards, and almost every card has some additional unique ability to it one way or the other, it creates an endlessly manipulable, constantly surprising experience
There are even more ways to take advantage of all your instances of life gain