No good magic card has, or should have, the ability to simply win the game
Starting with so many crucial keywords is great, and having access to all five colors means you can play the best buff cards to boot
Set Number 207 Language Italiano Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Timeless, Vintage Not Legal Formats Alchemy, Modern, Pauper, Pioneer, Standard Rulings (6/8/2016) Animate Dead is an Aura, albeit with an unusual enchant ability
A 4/4 card with Flying and Vigilance is still not one to dismiss outright though at a cost of 5 total mana, theres likely numerous other Angels, potentially cheaper in mana terms, that are better
Now, consider a scenario in which one color capitalized on this mechanic
Maybe I'm biased, but anyone who has been playing with Tana, the Bloodsower or has a deck that makes lots of saprolings is going to want this guy