Tier 1 units build?

How far can I get by building a swarm of tier 1 units?

I was thinking something like Mana Channelers + Runesmiths to summon a lot of zealots which benefit from race transformations. Add some bonuses like Mighty Meek from tome of the beacon to further increase their viability seems nice.

Are there any good builds focusing on swarms of tier 1 units? Or is this possibly a waste of time?

Possibly even combine it with Chosen Destroyers somehow, to get swarms of small units which are quickly produced in order to win the war of attrition against enemies?