Most of our single cards are second-hand, carefully checked, but some can also come directly from recent openings.
(At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
Commander Innistrad: Crimson Vow
Commander D&D: Adventures in the Forgotten Realms
Modern Horizons 2
Secret Lair Drop Series
Commander Anthology