With Sanction in our keep, if ANY pile is empty, we can end the round with one action by drawing from it.

First, we play Purity into our keep, which takes us from 0 to 10 coins in one fell swoop. Then, we use Sanction to draw from the right (empty) pile, ending the round with us ahead.

It is our opponent's failure to account for this that allows us to win. Had any player played any coin card on us (making us impure), this would not be possible!