

This mod lets you change the side deck to something other than squirrels, and allows changing the number of cards in the side deck, having more than one type of card in the side deck, and having cards be selected when starting the run.
"extensionProperties": {
"CSDIsSideDeck": "true",
"CSDSideDeckType": "Basic"
}
Basic side decks work like most side decks: they have 10 copies of one type of card.
"extensionProperties": {
"CSDIsSideDeck": "true",
"CSDSideDeckType": "SetCount",
"CSDNumCards": "3"
}
Set Count side decks are like Basic ones, except that you can set the number of cards in the deck using the CSDNumCards extension property.
"extensionProperties": {
"CSDIsSideDeck": "true",
"CSDSideDeckType": "Configurable",
"CSDNumCards": "10",
"CSDNumOptions": "4",
"CSDOption1": "Squirrel",
"CSDOption2": "Bee",
"CSDOption3": "Rabbit",
"CSDOption4": "Geck"
}
Configurable side decks allow the player to choose which cards to put in the side deck before they start the run. Clicking on a card in the Configure Side Deck screen cycles through the options. There are CSDNumCards cards in the deck, each of which can be any of the CSDOptions. Make sure that the number of CSDOption properties is the same as the value of CSDNumOptions, or it won't work.
"extensionProperties": {
"CSDIsSideDeck": "true",
"CSDSideDeckType": "Advanced",
"CSDNumCards": "5",
"CSDCard1": "Squirrel",
"CSDCard2": "Bee",
"CSDCard3": "Rabbit",
"CSDCard4": "self",
"CSDCard5": "conf",
"CSDNumOptions": "2",
"CSDOption1": "Cat",
"CSDOption2": "Goat"
}
Advanced side decks can do everything that the other types of side decks can, and they also allow setting a specific amount of each type of card. In any of the CSDCard properties, you can enter the name of a card directly, or, alternatively, you can enter self or conf. CSDCards set to self will be the card the extension properties are on, while CSDCards set to conf will act like the cards in a Configurable side deck. Make sure that the number of CSDCard properties is the same as the value of CSDNumCards, and that the number of CSDOption properties is the same as the value of CSDNumOptions or it won't work.