The idea came from the different sprite that the buffed Wraithlings get from Wraithling Fury or by the BBS acquired with Variax when you play Lilithe: having the Wind Dervishes change their sprites when they get buffed from certain cards or when their stats go over a certain number, for example if you get to play all the Scion’s wishes on a Dervish, or even after playing Dune Caster on it.
SC2 Archon also gave me the idea as to me screams dervishness (well, Vet screams Protossness actually), I mean look at this guy:
This is what seem to be one of them facing a Ultralisk Makantor Warbeast:
My life for the Imperium!