Oskar, Rubbish Reclaimer {3}{U}{B}
Legendary Creature — Human Wizard
Identity
Dimir
EDHREC rank
#10,686
Cheapest printing
US$0.49
TCGplayer
Printings
3
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.
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.