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I will concede that having it on a planeswalker isn't great as they become a target for everyone to attack into but I still think it's an upgrade as it gives you flexibility

Life-Gain - This is an ideal Zombify effect in life gain which is the most registered archetype in the Commander format according to EDHREC.com

This spirit dragon has evasion and great stats for its cost, and very easily draws an extra card every turn with just one or two other creatures in play

For a deck with twelve dredgers, the odds of finding one is 54,5%, much lower compared to Tome Scour

Its cheaper to cast, fetchable with Urza's Saga, and copies both activated and triggered abilities