An ability that triggers "whenever you surveil" triggers after you're done surveilling, even if you have fewer cards in your library than the number of cards you're instructed to surveil. It even triggers if you have no cards in your library.
05-10-2018
wotc
If you surveil before Whispering Snitch enters the battlefield, surveilling again during that turn won't cause its ability to trigger.
05-10-2018
wotc
In a Two-Headed Giant game, Whispering Snitch's ability causes the opposing team to lose 2 life and you gain 1 life.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.