He is a durable sac outlet with a direct game closing payoff
Thankfully, to rectify this issue somewhat, Wizards has stated the issue is being corrected digitally for Murders at Karlov Manor on MTG Arena. Alongside this, physical copies of Fanatical Strength that are printed post-release will also feature the correct, updated, artwork
When a non-angel creature you control dies, Avacyn transforms
This Grizzly Bear (2/2) has evasion in menace
Cankerbloom has to sacrifice itself to use its ability, unlike Reclamation Sage, but it has superior stats and can choose to proliferate instead of destroying an artifact or enchantment
The bit about the ability to trigger only twice each turn wasn't as limited as WotC thought, especially when you create new creatures for which it is counted separately