Indeed, past Jafar Enchanteds (the one from Inklands) is only moderately valuable for an Enchanted card
Lost Origin is similar to Astral Radiance, in that it contains a subset of Trainer Gallery cards that can be pulled from the set
The front card can buff a creature for +1, but what you want to do is transform right away by dropping a token
The card also has sweet interactions with a several commanders
Once you are casting spells for free, cascading into more spells, and refilling your hand, it becomes very hard for opponents to stop the snowball
A year or so ago, I put together a mono-red deck that relied on looping the three extra turn spells available: Final FortuneFinal Fortune, Last ChanceLast Chance, and Warriors OathWarriors Oath