Noticed that changes made in setup have drastically reduced cards after filtering. Redoing setup and it's associated files to fix this

exceptions.py

@@ -0,0 +1,85 @@
+"""Custom exceptions for MTG Python Deckbuilder setup operations."""
+
+class MTGSetupError(Exception):
+    """Base exception class for MTG setup-related errors."""
+    pass
+
+class CSVFileNotFoundError(MTGSetupError):
+    """Exception raised when a required CSV file is not found.
+    
+    This exception is raised when attempting to access or process a CSV file
+    that does not exist in the expected location.
+    
+    Args:
+        message: Explanation of the error
+        filename: Name of the missing CSV file
+    """
+    def __init__(self, message: str, filename: str) -> None:
+        self.filename = filename
+        super().__init__(f"{message}: {filename}")
+
+class MTGJSONDownloadError(MTGSetupError):
+    """Exception raised when downloading data from MTGJSON fails.
+    
+    This exception is raised when there are issues downloading card data
+    from the MTGJSON API, such as network errors or API failures.
+    
+    Args:
+        message: Explanation of the error
+        url: The URL that failed to download
+        status_code: HTTP status code if available
+    """
+    def __init__(self, message: str, url: str, status_code: int = None) -> None:
+        self.url = url
+        self.status_code = status_code
+        status_info = f" (Status: {status_code})" if status_code else ""
+        super().__init__(f"{message}: {url}{status_info}")
+
+class DataFrameProcessingError(MTGSetupError):
+    """Exception raised when DataFrame operations fail during setup.
+    
+    This exception is raised when there are issues processing card data
+    in pandas DataFrames, such as filtering, sorting, or transformation errors.
+    
+    Args:
+        message: Explanation of the error
+        operation: The DataFrame operation that failed (e.g., 'color_filtering', 'commander_processing')
+        details: Additional error details
+    
+    Examples:
+        >>> raise DataFrameProcessingError(
+        ...     "Invalid color identity",
+        ...     "color_filtering",
+        ...     "Color 'P' is not a valid MTG color"
+        ... )
+    """
+    def __init__(self, message: str, operation: str, details: str = None) -> None:
+        self.operation = operation
+        self.details = details
+        error_info = f" - {details}" if details else ""
+        super().__init__(f"{message} during {operation}{error_info}")
+
+
+class ColorFilterError(MTGSetupError):
+    """Exception raised when color-specific filtering operations fail.
+    
+    This exception is raised when there are issues filtering cards by color,
+    such as invalid color specifications or color identity processing errors.
+    
+    Args:
+        message: Explanation of the error
+        color: The color value that caused the error
+        details: Additional error details
+    
+    Examples:
+        >>> raise ColorFilterError(
+        ...     "Invalid color specification",
+        ...     "Purple",
+        ...     "Color must be one of: W, U, B, R, G, or C"
+        ... )
+    """
+    def __init__(self, message: str, color: str, details: str = None) -> None:
+        self.color = color
+        self.details = details
+        error_info = f" - {details}" if details else ""
+        super().__init__(f"{message} for color '{color}'{error_info}")