What sorcery is this?

Spoiler: lots of messing around

☺☻§♣5♣♥3♥♥$♠$4↓☻♣§6-NbUbYW•◘○◘♦))Ü,(←╚▐:è▬╞¿─■æ♣♦♠☺☻♥‼%#$@baR♥ ▼@AEDC♀♪♫☼►◄↕w↑↓↨→§∟↔♫§)*+-./0134568;9:=>?@ABCDEGHHJKLMNOQRSTUVWXY[\]^_`abca]^○

how the heck are you supposed to remember what does what?

 

Either get a photographic memory, or look up the list of codes. If you really wanted to, you could make a chart of all the different combinations and the image they create for reference. But that's up to you.

♣♠♦♥ ~Pick your suit.