Beginner Series
Singleton vs. Constructed
Commander only lets you run one of almost everything. That single rule reshapes how you build a deck more than any other format difference.
Jump to section ▾
The basics
In 60-card constructed formats, you can run up to four copies of most cards, meaning your best cards show up reliably, game after game. Commander flips that: it's a singleton format, so you get exactly one copy of almost everything. Which side of that line a format sits on is the first thing worth knowing about it, and the format guide sorts every one of them by it.
That single change ripples through every part of deckbuilding. You can't just run "four copies of your best removal spell." You need several different removal spells that each do a similar job. Consistency has to come from effect density and redundancy of role, not literal card copies.
A constructed deck asks "how many copies of my best card can I fit." A Commander deck asks "how many different cards can I find that do roughly the same job."
the core deckbuilding shift between formats
The official rule
Constructed deck limits come from rule 100.2a; the Commander singleton rule comes from rule 903.5b.
Comprehensive Rules · Rule 100.2a
"In constructed play... each deck has a minimum deck size of 60 cards. A constructed deck may contain any number of basic land cards and no more than four of any card with a particular English name other than basic land cards."
Comprehensive Rules · Rule 903.5b
"Except for basic land cards, no two cards in the deck may have the same English name."
Examples
Building the same "slot" two ways
In a 60-card deck, you might run 4 copies of Lightning Bolt to reliably have cheap removal available.
In Commander, you can only run 1 Lightning Bolt, so you fill that same functional slot with Lightning Bolt, Path to Exile, Swords to Plowshares, and several other one-mana removal spells.
The deck ends up with more variety but a similar overall density of "cheap removal" as a category.
How to take advantage of it
Tutors are premium in singleton. A card that searches your library for a specific answer is far more valuable in Commander than in a four-copy format, since it's the only reliable way to guarantee access to your single copy of something.
Think in categories, not specific cards. When deckbuilding, ask "how many cheap removal spells / how many draw effects / how many ramp pieces do I have," not "do I have four of my favorite one."
Redundancy of effect beats redundancy of card. Since you can't run four Sol Rings, look for several different cheap mana rocks that all do a similar job instead.
Cards & commanders that spotlight singleton design
Tutors
Cards whose entire job is finding your one copy of exactly what you need, when you need it.
Demonic Tutor ↗
Search your library for any card, straight to hand. The gold standard for turning singleton into "whatever I need."
Enlightened Tutor ↗
White's version. Search for an artifact or enchantment, to the top of your library instead of straight to hand.
Mystical Tutor ↗
Blue's take. Search for an instant or sorcery, put it on top of your library to draw next turn.
Effect redundancy staples
Cards commonly run alongside several similar effects to fill the same functional role a four-of would in constructed.
Commander spotlight
A commander whose entire design leans into the singleton format's breadth.
Commander Spotlight
Kenrith, the Returned King ↗
A five-color legend with five separate activated abilities, one per color: trample and haste, +1/+1 counters, life gain, card draw, and reanimation. It's a natural fit for singleton's breadth-over-depth philosophy: rather than four copies of one effect, Kenrith gives you access to five different effects from a single card.
Keep the table on the same page.
TurnZero HQ tracks life, turns, and moments so nobody's re-litigating what happened three plays ago.
Create Free Account