Nitymp wrote: When a card gets discarded it becomes destroyed - i.e. goes to the graveyard.
Alve wrote: Discarding a creature card does not trigger any on-destruction effects though. Despoiler won't automatically put itself on the battlefield when discarded and Scrounger won't pop up because a creature card is discarded. BUT they will land in your Graveyard, so you can resurrect them with spells/skills and their in-graveyard abilities will work normally. So let's say you discard the Scrounger then cast the Despoiler. When the Despoiler dies, the previously discarded Scrounger will pop into the battlefield.