grindstone/darksteel colossus

[Juggernaut GO]

what happens with the interaction between a grindstone with painters servant out and darksteel.

In a tournament setting are you required to mill the library entirely until only the darksteel is the last card remaining and the effect ends?

Is the match a draw?

What happens.

[Yare]

Detailed discussion of this issue

The player being milled will end up with a library containing just Darksteel Colossus.