Ash Zealot

• WWizards of the Coast2012-10-01
  Official Ruling
  Ash Zealot’s ability doesn’t allow any player to cast cards from a graveyard. Such cards need another way to be cast, such as the flashback ability.
• WWizards of the Coast2012-10-01
  Official Ruling
  Ash Zealot’s ability doesn’t trigger if you put a card onto the battlefield from a graveyard (using Grave Betrayal’s ability, for example).
• WWizards of the Coast2012-10-01
  Official Ruling
  Ash Zealot’s triggered ability will resolve before that spell resolves.

Rulings via Scryfall