The downside is that it's burdened by an energy discard that makes sustained attacks expensive
CONTRACT Your bid is a legal contract to purchase
If your opponent discards a card while you control Leyline of the Void, abilities that check whether a card is discarded (such as Hollow One, or a madness ability of the discarded card) still work, even though that card never reaches that player's graveyard
Case in point: The 2018 North America International Championships, an hour-long card game complete with real-time statistics and commentators announcing the moves of each player, has been watched by more than 200,000 people
Sam's Club memberships are 60% off today through Groupon, which is about the easiest win you are going to find if you like cheap bulk snacks, discounted tech, and occasional panic buys of kayaks you will never use