Colourless utility lands are the most seductive slots in a two-colour mana base: each one does something a basic cannot, and each one quietl...
Colourless utility lands are the most seductive slots in a two-colour mana base: each one does something a basic cannot, and each one quietly makes your coloured spells harder to cast. The question is never whether the utility is good — it usually is — but how many colourless sources your coloured requirements can subsidise before the subsidy becomes the story.
Real lands, read exactly
Wastes — Basic Land (mana cost ): {T}: Add {C}.
Reliquary Tower — Land (mana cost ): You have no maximum hand size.
{T}: Add {C}.
Every land named here can be checked in the MTGBrew card database — mana-base advice should always survive a trip to the oracle text.
How to apply this to your deck
Budget them like a tax on your pips. Count your sources per colour first, with every colourless land contributing to neither column; then count your early double-pipped spells, because those are the casts that fail first. Most two-colour decks can carry a small handful of colourless utility lands comfortably — the count shrinks as the curve gets lower and the pips get denser, and grows in decks whose spells are mostly single-pipped or colourless-friendly. When a utility land and a coloured source compete for the last slot, ask which failure you would rather lose to: missing the utility effect, or missing the spell entirely.
Build the list in the MTGBrew AI deck builder and count your coloured sources colour by colour against the spells you actually cast early; the MTGBrew Learn guides return to this habit in every mana-base piece, because most 'bad luck' in Commander is a mana base quietly miscounted at build time.
If this topic is on your bench, keep going with Jeska's Will in Commander: What It Does and Which Decks Want It — it covers the neighbouring decisions from a different angle, and the two pieces together give you a fuller picture than either one alone.
The short version
A mana base is a promise your deck makes to its own curve. Keep the promise measurable — sources per colour, lands that enter untapped when the early game needs them, utility slots that still tap for mana — and the strategy on top of it gets to be the reason you win or lose, instead of the lands deciding before the game starts.
Keep reading
Keep reading: Jeska's Will in Commander: What It Does and Which Decks Want It and Mana Base Guide: Two-Color Commander Decks — Duals, Basics, and the Right Split.
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