Are there any disadvantages if a waystone is corrupted like this one ?
What is the advantage or disadvantage?
Is he still worth as much as a blank Waystone?

LOOKS LIKE HE HAS
ELEMENTAL WEAKNESS
TURBO
EXTRA DAMAGE AS
PEN

WHICH ARE ALL A DISADVANTAGE

For sure you also have a big advantage. For each Prefix modifier you get Quant,Rarity and packsize in your maps. For each suffix modifier you get higher Waystone drop chance.

the only way to play T16s maps...its to corrupt T15s....so thats 1 advantage and u might get a waystone % boost corrupting ur map as well thats the last advantage