Serpent Wig unexpected behaviour?

This enemy priest played one Naga, then repeatedly played recursive Serpent Wigs that kept recreating, even though the text says “if you played a Naga while holding this”. The priest did not play a nage in between usages of serpent Wig, so how in the world did they keep creating more?

To reacreate:

Be Priest
Play Radient Elemental
Play any one Naga minion
Play an infinite number of Serpent Wig for free