Summon Swarm vs Summon Nature's Ally

[Mr Dice Guy]

So, I SWORE there was a feat/archtype/class feature (etc) that allowed you to summon swarm spontaneously, similar to the druid's summon nature's ally spontaneous casting.
I have searched the PFSRD, Google, my PFRPG books. Am I crazy? Please help me find this somewhere.... maybe it was 3.5 long ago?
("Mr Dice Guy, you are crazy" is a valid response)

[LazarX]

No such archetype in Paizo's offerings.

So..Mr. Dice Guy, you are crazy. :)

At upper levels, the spell you want is Creeping Doom.