As Designed Players should not be allowed to name cards that do not exist in gatherer.


201.4. If an effect instructs a player to choose a card name, the player must choose the name of a card in the Oracle card reference. (See rule 108.1.) A player may not choose the name of a token unless it’s also the name of a card.

There are several cards which are legal in constructed formats and on mtgo which are not on gatherer. Cards from the stranger things secret lair (as well as their universes within reprints) as well as +2 mace are omitted from gatherer and should be immune to pithing needle and similar effects.