So, I haven't used Draven in awhile now, but recently my abilities have been invisible on the Soul Reaver skin.
The enemy team one game even pointed out that my skills were invisible.
My Q auto's don't show, my E doesn't show and my R only shows a trail of sparks. 
I literally just played with this skin and didn't see any of these bugs occur, so I have no idea. However, I do know that Draven has a bug where if you use any ability, other than Q (and most of the time with W), he will keep the spinning axes, but they will not be spinning until you throw them and will look like you're throwing a regular axe, but sometimes it's invisible
just saw this happen in my game, draven's auto attack were blue blurs and his e was invisible.
I had this happen to me as well. My empowered Q autos didn't show the axe (only a blur effect - so it looks like Draven is throwing orbs). E was invisible with small glitter effect but no axe.
