Oskar, Rubbish Reclaimer is a rare Legendary Creature — Human Wizard card from New Capenna Commander (NCC), collector number 177. Current market price: $3.50, TCGplayer market prices via Scryfall.
This spell costs {1} less to cast for each different mana value among cards in your graveyard. Whenever you discard a nonland card, you may cast it from your graveyard.