Knight of the Reliquary is a rare Creature — Human Knight card from Modern Masters (MMA), collector number 178. Current market price: $2.35 (foil $5.00), TCGplayer market prices via Scryfall.
This creature gets +1/+1 for each land card in your graveyard. {T}, Sacrifice a Forest or Plains: Search your library for a land card, put it onto the battlefield, then shuffle.