How to Build a Magic: The Gathering Deck — A Complete Guide for New and Returning Players

Magic: The Gathering (MTG) has been running for over 30 years, and its deck-building system is both its greatest strength and the thing that most intimidates new players. Whether you're building your first deck or rebuilding after a long break, understanding the underlying structure makes everything else click.

The Core Anatomy of an MTG Deck

Every legal MTG deck shares a few universal rules:

• Minimum 60 cards in your main deck (for most formats)
• Maximum 4 copies of any single card (except basic lands)
• A sideboard of up to 15 cards for best-of-three matches

These aren't suggestions — they're the rules of the format. Beyond that, deck construction is where strategy lives.

The Land Foundation

Lands are what make everything work. They produce mana, the resource you spend to cast spells. A common starting point is 24 lands in a 60-card deck, though this varies based on your deck's mana curve — the average converted mana cost of your spells.

• Low-curve aggressive decks (lots of 1- and 2-cost cards) can run 20–22 lands
• Midrange decks typically sit at 23–25 lands
• Control and ramp decks with expensive spells often want 26+ lands

Get the land count wrong and your deck either floods (too many lands, not enough spells) or gets mana-screwed (not enough lands to cast what you're holding).

Choosing Your Colors 🎨

MTG uses five colors — White, Blue, Black, Red, and Green — each with its own identity and strengths:

Most beginners do well starting with one or two colors. More colors means more power options but significantly more complex mana requirements. Running three or more colors demands a well-built mana base with dual lands and fixing spells — which increases both cost and complexity.

Building Around a Strategy

A deck needs a win condition — a clear plan for how it beats the opponent. The three most common strategic archetypes are:

Aggro: Win fast. Flood the board with cheap, efficient creatures and deal damage before the opponent can set up. Every card should either attack or support attacking.

Control: Win late. Slow the game down with counterspells and removal, then win with a powerful finisher or card advantage. Patience and card selection matter more than raw power.

Midrange: Win the value game. Play efficient threats that trade favorably with the opponent's cards, and adapt to what the game demands. The most flexible of the three.

There are also combo decks that win by assembling specific card interactions, but these are generally harder to build and pilot effectively.

The Mana Curve and Card Selection

Once you have a strategy, you need cards that support it consistently. Consistency comes from two things: running enough copies of your best cards and having a sensible mana curve.

A rough starting framework for a 60-card aggro deck:

• 20–22 lands
• 8–12 one-drops (1-mana creatures or spells)
• 8–12 two-drops
• 4–8 three-drops
• A few four-drops at most

For midrange or control, the curve shifts higher, but the principle stays the same: you should reliably be casting something meaningful every turn.

Run 3–4 copies of your best cards. Running 1-ofs and 2-ofs makes your deck inconsistent — you'll rarely see those cards when you need them.

Understanding Card Types and How They Interact

MTG cards fall into distinct types, each with different timing rules and roles:

• Creatures — your primary attackers and blockers
• Instants — can be played any time, including on your opponent's turn 🃏
• Sorceries — powerful effects, but only playable on your own turn
• Enchantments — persistent effects that stay on the battlefield
• Artifacts — colorless permanents with varied functions
• Planeswalkers — high-value cards that act as secondary win conditions

A healthy deck usually has a mix of card types to avoid being predictable and to handle different game states. A deck of nothing but creatures gets demolished by board wipes; a deck of nothing but removal runs out of ways to actually win.

The Sideboard: Your Secret Weapon

In competitive play, you sideboard between games. The sideboard lets you swap in targeted answers for specific strategies you're struggling against — graveyard hate against reanimator decks, artifact removal against artifact-heavy strategies, and so on.

Even at a casual level, thinking about your sideboard teaches you a lot about your deck's weaknesses and what you'd want to have in different matchups.

Format Determines Everything

One factor that shapes every decision above is which format you're playing:

• Standard — only recent sets, constantly rotating
• Modern — cards from 2003 onward, no rotation
• Legacy / Vintage — nearly all cards legal, very powerful and expensive
• Commander (EDH) — 100-card singleton decks, one commander card, multiplayer
• Draft / Sealed — you build from limited card pools on the spot

A 60-card aggro deck built for Standard plays completely differently from a Commander deck built around a legendary creature. The format determines your card pool, your budget requirements, and even the pace of games you'll experience.

What the right deck actually looks like for you depends on which format draws you in, how competitively you want to play, what cards you already own, and whether you're optimizing for fun, budget, or tournament performance. Those variables produce wildly different decks — even from players who understand every principle above equally well.