Which skins are banned in the EU and NA LCS?

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I believe it would be any skin that cannot be purchased anymore since its basically a free form of advertising for riot. Im not 100% on this though.

Doesn't explain how GIA Werlyb was able to use the much smaller "The Mighty Jax" skin during this week's EU LCS matches, though. If they were banned from competitive use, that game would need to be restarted. They weren't.

I only know of two that are banned, for sure.

1. Underworld Twisted Fate: The ghost cards are hard to read and they have a different animation when they travel.
2. Steel Legion Lux: The particles are tough to see and the visuals on her ult are thinner than the actual width of the beam.

I'm still curious what the eSports team says are banned, though.

I guess both the Mighty Jax and Bobsled Corki having smaller than normal sprites must be okay.