Being able to cast your deck is the most crucial
For the cheapest way to ship trading cards, choose an option providing a good level of safety and security
Note that you must find a reason to discard the card in the first place

Example Decklist: Delney, Streetwise Lookout in Commander Baylen, the Haymaker | Illustration by Ryan Pancoast Commander (1) Planeswalker (1) Creature (35) Enduring Innocence Esper Sentinel Hare Apparent x28 Knight of the White Orchid Loran of the Third Path Phelia, Exuberant Shepherd Welcoming Vampire Witch Enchanter // Witch-Blessed Meadow Instant (11) Akroma's Will And They Shall Know No Fear Clever Concealment Dawn's Truce Eerie Interlude Erode Flawless Maneuver Galadriel's Dismissal Parting Gust Swords to Plowshares Thraben Charm Sorcery (4) Dusk // Dawn Morningtide's Light Raise the Past The Battle of Bywater Enchantment (3) Assemble the Players Caretaker's Talent Dawn of a New Age Artifact (9) Arcane Signet Marble Diamond Patchwork Banner Pearl Medallion Skullclamp Sol Ring The Mind Stone Thought Vessel Throne of Eldraine Land (36) Abandoned Air Temple Eiganjo, Seat of the Empire Emeria, the Sky Ruin Fountainport Minas Tirith Nykthos, Shrine to Nyx Plains x26 Scavenger Grounds Talon Gates of Madara War Room Windbrisk Heights This Delney, Streetwise Lookout deck is pretty straightforward

Besides, being able to ensure we draw the Fleshbag Marauder or Diregraf Colossus or Kalitas, Traitor of Ghet we need is worth a fair bit more than a mana when it works
Sacrifice after IV.) I, II, III - Pain - You draw a card and you lose 1 life