We had an issue arise recently with Painter's Servant and Glittering Wish.

If I painter's servant and name blue, will I be able to glittering wish for a stony silence in my sideboard?

The real question whether or not characteristic defining abilities generated in game extend to the sideboard (i know CDAs printed on cards in the sideboard work while in the sideboard).

Nope. Painter's Servant can only affect cards in one of the game zones. It will not affect cards outside of the game, like the sideboard. The cards in your sideboard are not affected by the Servant's ability, and you could not use Glittering Wish to get the Stony Silence out of your sideboard.

400.10a Cards in a player’s sideboard are outside the game. See rule 100.4.

400.10c Cards outside the game can’t be affected by spells or abilities, except for characteristic-defining abilities printed on them (see rule 604.3) and spells and abilities that allow those cards to be brought into the game.

Nathan Long
Magic Rules NetRep