How to Build a Deck from Your Collection
A step-by-step guide to help you build a deck from your collection quickly and accurately.
Most Magic players own the cards for at least two or three decent decks without knowing it. The problem is that without a digital catalog of your collection, you are essentially guessing at what you have. A typical player who has been collecting for two or more years probably owns 80 to 90 percent of a solid Commander deck if they could only find the cards. Scanning your entire collection first and then building from what you have is how you go from spending $150 on a new deck to spending $20 on the few specific cards you are actually missing. This guide walks through the full process, including which formats are easiest to build from a collection, how to identify cards you already own that are undervalued, and how to evaluate which missing cards are worth buying versus substituting.
Step-by-Step Guide
Scan your full collection before you start building
This is the step most players skip and the reason they buy duplicates. Before you look at a single decklist, scan everything you own into Lotus Scan. Prioritize your rares and mythics since these are the cards most likely to be key pieces of a deck. Include your bulk boxes too. Players constantly discover that they own copies of Smothering Tithe, Rhystic Study, or Sol Ring buried in a box from three years ago. A complete scan takes a few hours but saves you money every time you build a deck afterward. Once your collection is cataloged, building from it becomes your default first step rather than an afterthought.
Tip: Create separate collection groups in Lotus Scan for your different physical storage locations: binders, boxes, and current decks. This makes it much easier to physically pull cards once you know you own them.
Choose a format and find a starting decklist
Commander is the best format to build from a collection because each deck runs 99 unique cards and tolerates budget substitutions extremely well. A Commander deck that would cost $300 new can often be built for $30 to $50 from a mixed collection because you already own lands, ramp spells, and removal that appear across many decks. For Commander ideas, go to EDHREC and search for a commander in your favorite colors. Sort by popularity and use the budget filter to see which versions of the deck rely on commonly owned cards. For Modern and Pioneer, MTGGoldfish has current tier lists with full decklists and prices. Pick something you enjoy playing, not just something that is cheap, because a deck you enjoy is the one you will actually finish building.
Tip: EDHREC's average deck view shows the most commonly included cards for any commander, which correlates strongly with cards players tend to already own from general collecting.
Cross-reference the decklist against your collection
Go through the decklist card by card and check Lotus Scan for each one. This is tedious for 99-card Commander decks but it is where you discover the genuine surprises. Most players going through this process for the first time find they own 50 to 70 percent of the cards they need. Make two lists: cards you own and cards you need to acquire. For the cards you own, note which collection group they are currently in so you know where to find them physically. If a card is in another deck, note that too, because you will need to decide whether to pull it or find a substitute.
Find budget substitutes for expensive missing cards
For cards you do not own and that cost $15 or more, look for functional substitutes in your existing collection before buying. The goal is to find cards that do the same job at a fraction of the price. Some common substitutions: instead of Cyclonic Rift ($10+) try Flood of Tears or Whelming Wave. Instead of Demonic Tutor ($15+) try Diabolic Tutor or Scheming Symmetry. Instead of The One Ring ($20+) try Skullclamp or Phyrexian Arena for card draw. These substitutes rarely perform identically but they let you play the deck immediately while you acquire upgrades over time. Lotus Scan's price data helps you quickly verify which cards in your collection are worth including versus which ones are genuinely too weak.
Tip: Check your trade binder for the cards you're missing before buying them. Trading for needed pieces is effectively free if you are moving cards you no longer need.
Price out the remaining cards you need to buy
For the cards you need that have no good substitute, use Lotus Scan to check current prices and prioritize them by importance to the deck strategy. Focus your buying budget on the three to five cards that are essential to what the deck is trying to do, and leave the nice-to-have upgrades for later. A Commander deck where you own 80 percent of the cards and need to spend $25 to $40 on the remaining pieces is extremely common. If the remaining cards total more than $60 to $80, reconsider whether some of the more expensive pieces have acceptable substitutes that get you playing now. The best deck is one you can actually assemble and play tonight.
Tip: Buy the mana base last, not first. Fixing your mana with expensive lands is an upgrade, not a requirement. Budget basics and tap-lands let you play the deck fine while you acquire better lands over time.
Pull the physical cards and track what left each deck
Using your Lotus Scan collection groups, locate each card physically and pull it for your new deck. If you are pulling cards from existing decks, update those deck records in the app to reflect that the card moved. This step is where having organized physical storage pays off completely: if your physical and digital organization match, this step takes 20 minutes instead of two hours of digging through boxes. Once assembled, create a new collection group in Lotus Scan for your new deck and scan the final list in. This creates a permanent record of the deck and its value at the time you built it.
Make It Easier with Lotus Scan
Lotus Scan for iPhone simplifies this entire process with AI-powered card recognition, real-time price tracking, and intuitive collection management. Just point your camera and scan.
Pro Tips
- Create a 'Staples' collection group in Lotus Scan for cards that go in many decks: Sol Ring, Command Tower, Arcane Signet, Swords to Plowshares, Counterspell. Building new Commander decks becomes dramatically faster once you know exactly where your staples are.
- Commander precon decks from recent years are excellent value sources for collection-builders. A $45 precon often contains $60 to $80 in singles plus immediately playable cards you can strip for other decks.
- Check EDHREC for your commander and look at which cards appear in over 80 percent of decks featuring that commander. These are the must-haves. Cards appearing in 20 to 40 percent of decks are often good but substitutable.
- Lands are almost always the most swappable part of a Commander deck. A deck with basic lands, Evolving Wilds, and Terramorphic Expanse plays fine while you upgrade to better fixing over time.
- If you own multiple copies of a card, consider whether they belong in multiple decks or whether one deck should get the best copy and other decks get budget versions or substitutes.