Aftermath Analyst is a uncommon Creature — Elf Detective card from Murders at Karlov Manor (MKM), collector number 148. Current market price: $1.89 (foil $4.00), TCGplayer market prices via Scryfall.
When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.) {3}{G}, Sacrifice this creature: Return all land cards from your graveyard to the battlefield tapped.