This is an implementation of various math and probability theory written in Rust.

You should be able to compile the program using

$ rustup default nightly

And then

$ cargo run 

We try to figure out how to design a deck such that you have the best chance of being to cast your spells. In Magic, you design your own 40-card or 60-card deck. Cards in your deck are either a land or a spell.

You start the game by shuffling your deck, drawing 7 cards. If you like your hand, you keep it, but if you don't you can shuffle the deck again, drawing 6 cards. You repeat this process until you are happy. This is called "mulligan". If you take a mulligan, you will be able to look at the top card of the deck, and either keep it there, or put it on the bottom of the deck.

You can play one land per turn. This makes mana available for you to cast your spells. The mana-cost is different depending on the spell. This means that you can only play spells that cost 1 on turn 1, 2 on turn 2 and so on, provided that you have land in your hand.

For each turn (except the first if you are on the play), you draw a card from your deck.

Spell cost is either colored or not. There are five colors in magic, (white, blue, black, red and green). A spell that is 1W, for instance requires one white mana and one mana of any color. Some spells require colorless mana.

There are different land-types too. Basic lands produce one mana of its own color (plains => white, island => blue, swamp => black, mountain => red, forest => green); some only produce colorless mana; some lands can produce one of two colors (dual-lands); and some may even produce any color.

You may only put up to 4 cards of the same type in your deck, except for basic lands, you can put any number of those in your deck.