A full guide on how to measure and tune the power of your Commander deck merits its own article, and I plan to write that soon
You can build a virtual collection, but you don't actually own anything tangible
That mana can be any color or colorless.
Its not the most valuable card out of the bunch, but it currently has a retail price of around $15 depending on platform, quality, and grading

Evasion Strategy : 25 cards Changeling Outcast, Merfolk Windrobber, Slither Blade, Triton Shorestalker, Azure Beastbinder, Dauthi Voidwalker, Ghostly Pilferer, Invisible Stalker, Krydle of Baldurs Gate, Mercurial Spelldancer, Oonas Blackguard, Shoreline Looter, Soaring Thought-Thief, Thieving Skydiver, Blackbloom Rogue, Halo Forager, Nighthawk Scavenger, The Destined Thief, Enigma Thief, Access Tunnel, Escape Tunnel, Rogues Passage, Soaring Seacliff, Ringsight Mill Strategy : 28 cards Merfolk Windrobber, Thieves Guild Enforcer, Duskmantle Guildmage, Krydle of Baldurs Gate, Soaring Thought-Thief, Anowon, the Ruin Thief, Consuming Aberration, Syr Konrad, the Grim, Drown in the Loch, The Water Crystal, Maddening Cacophony, Didnt Say Please, Thought Collapse, Archive Trap, Traumatize, Cut Your Losses, Mindcrank, Riverchurn Monument, Bloodchief Ascension, Court of Cunning, Fraying Sanity, Psychic Corrosion, Kitsunes Technique, Duskmantle, House of Shadow, Ipnu Rivulet, Nephalia Drownyard, Jidoor, Aristocratic Capital, Singularity Rupture Anowon, the Ruin Thief makes all our Rogues having Mill synergy when they deal combat damage to a player and that works wonders with our Evasion strategy

What started as a personal hobby quickly grew into a joyful project.