These are all true of the card and stop him from being a real power house or a mainstay in any archetype but they are not sufficient to render him unworthy of an A cube slot
EDIT: It was quickly pointed out to me after the article/video was released that a better comparison to Mangara is Kraum, Ludevic's Opus, which share the most important trigger
Cards with acorn stamps are only for use in casual formats, thus alleviating the issue of needing to print sets with non-tournament legal cards in entirely silver borders
4 Stitch, New Dog He's More Than Just A Puppy In comparison to these other cards that have had a cost of three, five, and even seven, it probably seems odd to see a cost one card so high up on the list
Instants & Sorceries - 11
As Foretold from the grave, it is not