Changes

"If this card was discarded to the graveyard by a card effect: Special Summon it from the graveyard, then, if it was discarded from your hand to the graveyard by an opponent's card effect, your opponent returns exactly 2 cards from their hand to the bottom of their deck, in any order."

Notice the subtle differences, like how Snoww states that it's effect is triggered by an opponent's cartd effect, but Sillva clearly states that any discard effect activates effect 1 but not effect 2.