Agadeem Occultist sadly can only put creatures into play from an opponent's graveyard, so that possibility would only work if you were playing against another ally deck or ran a conspiracy or two. If that where the case then yes, since all Ally abilities are "when an ally enters the battlefield", they all trigger again. If the text stated "when you cast an ally spell" then it would not.
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You never need more than two Loremasters.
Friend is making similar deck. Uses "Consume The Meek" or "Earthquake" to kill all opponents small creatures, then uses Consuming Vapor to eliminate the larger threats and gain life off them. Don't know if Flame Slash is worth it, I personally stray from burn spells that can't target players, but I can easily see why you'd be tempted!