serra

Serra is my personal Magic: The Gathering collection tracker.

It began as a holiday project in winter 2021/2022 because I was frustrated of Collection Tracker Websites that are:

• Pain to use
• Want ~$10 a month
• Don't have the features I want

So I started my own Collection Tracker using Golang, MongoDB and Scryfall to have an overview in what cards you own and what value they are.

What Serra does

• Tracks prices
• Calculates statistics
• Query/filter all of your cards
• Shows what cards/sets do best in value development.

What Serra does not

• Does not give a shit about conditions (NM, M, GD...)
• Does not track if card is foil or not (may come in the future)
• Is not configurable to have Dollar/US Prices

Quickstart

on macOS you can use

brew install noqqe/tap/veilig

on Linux/BSD/Windows you can download binaries from

https://github.com/noqqe/serra/releases

After that you need to spin up a MongoDB yourself or use the docker-compose setup included in this Repo:

docker-compose up -d
export MONGODB_URI='mongodb://root:root@localhost:27017'

After that, you can add a card

./serra add usg/17

Start exploring :) (the more cards you add, the more fun it is)

Usage

The overall usage is described in --help text. But below are some examples.

./serra
Usage:
  serra add <cardid>... [--count=<number>]
  serra remove <cardid>...
  serra cards [--rarity=<rarity>] [--set=<setcode>] [--sort=<sort>]
  serra card <cardid>...
  serra tops [--limit=<limit>]
  serra flops [--limit=<limit>]
  serra missing <setcode>
  serra set <setcode>
  serra sets
  serra update
  serra stats

Add

To add a card to your collection.

Cards

Query all of your cards with filters

Sets

List all your sets

Set

Show details of a single set

Stats

Calculate some stats for all of your cards

Tops

Show what cards/set gained most value

Flops

Show what cards/set lost most value

Update

The update mechanism iterates over each card in your collection and fetches its price. After all cards you own in a set are updated, the set value will update. After all Sets are updated, the whole collection value is updated.

Adding all those cards, manually?

Yes. While there are serveral OCR/Photo Scanners for mtg cards, I found they are not accurate enough. They guess Editions wrong, they have problems with blue/black cards and so on.

I add my cards using a tiny shell wrapper, since they are sorted by editions anyways.

./add-card-wrapper.fish usg
read> 17
Updating Card "Herald of Serra" amount to 2

read> 18
...

Its basically typing 2-3 digit numbers and hitting enter. I was way faster with this approach then Smartphone scanners.

Development

Install

go build .
./serra

Cheatsheet Queries

Find cards that increased prices

db.cards.find({$expr: {$gt: [{$arrayElemAt: ["$serra_prices", -2]}, {$arrayElemAt: ["$serra_prices", -1]}]}}, {name:1})

Update card Price

	db.cards.update(
	{'_id':'8fa2ecf9-b53c-4f1d-9028-ca3820d043cb'},
	{$set:{'serra_updated':ISODate("2021-11-02T09:28:56.504Z")},
	$push: {"serra_prices": { date: ISODate("2021-11-02T09:28:56.504Z"), value: 0.1 }}});

Set value

db.cards.aggregate([{ $group: { _id: { set: "$set" }, value: { $sum: { $multiply: ["$prices.eur", "$serra_count"] } }, count: { $sum: 1 } } }])

Color distribution

 db.cards.aggregate([{ $group: { _id: { color: "$colors" }, count: { $sum: 1 } } }])

Calculate value of all sets

db.sets.aggregate({$match: {serra_prices: {$exists: true}}}, {$project: {name: 1, "totalValue": {$arrayElemAt: ["$serra_prices", -1]} }}, {$group: {_id: null, total: {$sum: "$totalValue.value" }}})

Calculate what cards gained most value in percent

db.cards.aggregate({$project: {set: 1, collectornumber:1, name: 1, "old": {$arrayElemAt: ["$serra_prices.value", -2]}, "current": {$arrayElemAt: ["$serra_prices.value", -1]} }}, {$match: {old: {$gt: 2}}} ,{$project: {name: 1,set:1,collectornumber:1,current:1, "rate": {$subtract: [{$divide: ["$current", {$divide: ["$old", 100]}]}, 100]} }}, {$sort: { rate: -1}})

MongoDB Operations

A few commands that do backups and exports of your data inside of the docker container.

Do a database dump

mongodump  -u root -p root --authenticationDatabase admin -d serra -o /backup/

Do a collection export to json

mongoexport  -u root -p root --authenticationDatabase admin -d serra -c cards > /backup/cards.json
mongoexport  -u root -p root --authenticationDatabase admin -d serra -c sets > /backup/sets.json
mongoexport  -u root -p root --authenticationDatabase admin -d serra -c total > /backup/total.json