ghouls don't apply on-hit effects
and no i'm still not seeing any way new yorick is overpowered. 1v1 he's pretty good but when you actually get into a teamfight, he flounders if he gets focused. in that way he's like morde but way weaker. his ultimate is decent, but it doesn't change the fact the other team gets gold.
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~Acting on Impulse~
Black Turtle still didn't MAJORA'S MASK