Limiting Swain's bird transformation to his Tyrant skin is a lame move, Riot
As you might know if you saw the reveal, Swain's ultimate got reduced from full-on transformation to just growing a pair of wings - thus removing a highly iconic part of the character. I was ready to give the benefit of doubt, like making two separate models would be too much work or something... and then I saw the PBE spotlight for Tyrant Swain, which retained the transformation.
So, what are you basically saying to Swain players is: "Hey guys, do you want to keep that highly iconic and badass transformation for your character? That will be 10 bucks!" That's just beyond lame. His transformation is something that should be on every skin by default.