Whatever cards you gave your departed teammate remain outside the game, but you can carry on as a solo player
Forge Anew 5 Printings and their Prices Track Forge Anew Prices Free collection tools for Magic: the Gathering
Its also got epic uncommon and commons such as (x2) Dark Dragonair, (x3) Dark Wortortle, (x3) Pikachu and (x4) Squirtle
they can't contain more than one copy of the same card except for basic lands
Commanders such as Syr Konrad, the Grim and Tormod, the Desecrator actually want creature cards to leave your graveyard in order to trigger their abilities, so you can benefit by delving things away to make Murderous Cut cost less mana
If you're looking to find any of these cards, rather than buying them outright as singles, then you'll want to pick up some Winterspell boosters ASAP