Methinks some posters have rose colored goggles. AST is not best of both worlds (WHM and SCH)--more like watered down versions but with buffs included. AST RNG is being seriously glossed over--and no you cannot "dramatically improve the chance" to get the card you want. Pass over what you're smoking. Not that AST can't do the job--but it's pretty clear from the many other threads there are a lot of people with issues (and it's not because they are all bad players). Also Selene's buff is not inconsequential not to mention SCH can give 10% dmg reduction without RNG and on demand and AOE absorb. Personally, I am having a hard time settling on a healing main myself, because they all have their pros and cons.