Ive gotten some random cards from various packs on Prerelease Weekend, but nothing quite beats getting a stack of exactly the cards that you want to start putting into your decks
Commander can be extremely accessible thanks to the many precon decks that regularly come out with new releases, though there are exceptions to this rule, such as with the Marvel Secret Lair MTG drops that were only available in a limited quantity

A Trail of Teacups Aang, Master of Elements Abandon Attachments Aether Syphon Agency Coroner All-Fates Scroll Alpharael, Dreaming Acolyte Alquist Proft, Master Sleuth Ambling Stormshell Ancestral Anger Ancestral Reminiscence April, Reporter of the Weird Arcane Epiphany Arcanis the Omnipotent Audience with Trostani Awaken the Honored Dead Bandit's Haul Bandit's Talent Bewildering Blizzard Beza, the Bounding Spring Biomechan Engineer Blitzball Bold Biochemist Bonecache Overseer Borrowed Knowledge Brass's Tunnel-Grinder Bruce Banner Byway Barterer Calamitous Tide Candlestick Captain Howler, Sea Scourge Case of the Crimson Pulse Casey Jones, Vigilante Cerebral Download Chalk Outline Chart a Course Cid, Timeless Artificer Circle of Power Clandestine Work Clive, Ifrit's Dominant Cloudblazer Colossus of the Blood Age Construct a Cosmic Cube Corrupted Conviction Cruel Truths Cryptex Decode Transmissions Demand Answers Demonic Pact Derelict Attic // Widow's Walk Derelict Attic // Widow's Walk Desperate Measures Dewdrop Cure Didact Echo Diresight Disturbing Mirth Doctor Octopus, Master Planner Does Machines Donatello's Technique Doomsday Excruciator Dragonfly Swarm Dreadwing Scavenger Dreamdew Entrancer Duelist of the Mind Eerie Gravestone Embrace the Paradox Emet-Selch, Unsundered Evidence Examiner Extraordinary Journey Fanatical Offering Fang, Fearless l'Cie Fear of Failed Tests

It works well with token making strategies that make small dorks like the 1/1s you see with Soldiers, Squirrels, Goblins or Saprolings
(6/8/2016) The target player is chosen as you announce Void, but the number isn't chosen until it's resolving
This effectively means +3/+3 for each player below half health