import re

def parse_deck_list(text):
    """
    Parses a deck list string and returns a list of dictionaries with quantity, card name, and is_sideboard.
    
    Supported formats:
    - Arena/Moxfield: "1 Laughing Jasper Flint (OTJ) 215 *F*"
    - MTGO: "1 Arcane Signet"
    - Plain Text: "1 Arcane Signet"
    
    Returns:
        list of dict: [{'quantity': int, 'name': str, 'is_sideboard': bool}]
    """
    lines = text.strip().split('\n')
    parsed_cards = []
    is_sideboard = False
    
    # Regex for Arena/Moxfield lines: e.g., "1 Card Name (SET) 123"
    # Captures: Qty, Name
    # We ignore Set code and collector number for lookup simplicity for now, relying on name.
    # Pattern: Digit+ space Name space (SetCode) space ...
    arena_pattern = re.compile(r'^(\d+)\s+(.+?)\s+\([A-Z0-9]+\)\s+\S+')
    
    # Regex for simple Quantity + Name: "1 Card Name"
    simple_pattern = re.compile(r'^(\d+)\s+(.+)$')

    for line in lines:
        line = line.strip()
        if not line:
            continue
            
        if line.lower().startswith('sideboard'):
            is_sideboard = True
            continue
            
        # Try Arena/Moxfield/detailed format first
        match = arena_pattern.match(line)
        if match:
            qty = int(match.group(1))
            name = match.group(2).strip()
            parsed_cards.append({
                'quantity': qty,
                'name': name,
                'is_sideboard': is_sideboard
            })
            continue

        # Try simple format
        match = simple_pattern.match(line)
        if match:
            qty = int(match.group(1))
            name = match.group(2).strip()
            parsed_cards.append({
                'quantity': qty,
                'name': name,
                'is_sideboard': is_sideboard
            })
            continue
            
    return parsed_cards