Were here to break it all down for you on the CK Blog
Absolutely, though everything in moderation
They can also destroy any permanent (Angel of Despair), gain you life (Angel of Mercy, Lightkeeper of Emeria), destroy many creatures (Sunblast Angel), save creatures (Adarkar Valkyrie, Twilight Shepherd), reanimate (Reya Dawnbringer, Karmic Guide), keep alive indefinitely (Platinum Angel), shut down abilities (Linvala, Keeper of Silence), destroy all lands (Desolation Angel), give your creatures Indestructibility (Deathless Angel), and proactively prevent all combat damage (Blinding Angel)
Best suited to players who enjoy a powerful but fair strategy with high variance and big plays
Yet here we are, with Sidar Jabari of Zhalfir and Knight tribal in Magics most controlling colors
If it's a permanent card, put it into your hand