Ghost Quarter
Land
Tap: Add 1 Mana to your mana pool.
Tap, Sacrifice Ghost Quarter: Destroy target land. Its controller may search his or her library for a basic land card, put it into play, then shuffle his or her library.
The search is optional, as the highlighted wording indicates. However, when putting the ability on the stack, the onus is on you to make clear what that ability entails. This is especially true at FNM where the focus is on teaching players to play better, not catch them out with superior rules and card knowledge. At a PT or GP, on the other hand, it's somewhat more likely that the players know what a Ghost Quarter does.
However, it's difficult to say more without knowing exactly how you announced the ability.