Aftermath Analyst is a uncommon Creature — Elf Detective card from Edge of Eternities Commander (EOC), collector number 91. Current market price: $0.98, 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.