diff --git a/cubedeck.py b/cubedeck.py
new file mode 100644
index 0000000..3475221
--- /dev/null
+++ b/cubedeck.py
@@ -0,0 +1,164 @@
+# Usage:
+#
+# Download cube list .txt from CubeCobra's export to .txt function
+#
+# $ python3 cubedeck.py MyCubeList.txt
+#
+#
+#
+# Enter card: Mo [tab]
+# Mogg War Marshal      Moment's Peace        Monastery Swiftspear  Mortarpod             Mountain
+# Moldervine Cloak      Momentary Blink       Monoskelion           Mortify
+#
+# Enter card: Moldervine Cloak
+#
+# Enter card: Moment's Peace
+#
+# Enter card: Momentary Blink
+#
+# Enter card: :u         # Undo last card added (Momentary Blink)
+#
+# Enter card: :nl        # Add empty line to separate sideboard
+#
+# Enter card: Monoskelion
+#
+# Enter card: 10 Forest  # autocomplete doesn't work with number
+#
+# Enter card: :ls        # List deck input so far
+# ['Moldervine Cloak', 'Moment's Peace', '', 'Monoskelion', '10 Forest']
+#
+# Enter card: :wq        # Save to file and open in default application
+# Saved deck to 20230425-001458.txt
+#
+# Enter card: :q         # Exit without saving
+
+from datetime import datetime
+
+import os
+import platform
+import readline
+import sys
+import subprocess
+
+
+def load_cube(cube_file):
+  cube = []
+  with open(cube_file) as f:
+    for line in f:
+      card = line.strip()
+      if card:
+        cube.append(card)
+  return cube
+
+
+BASIC_LANDS = ['Plains', 'Island', 'Swamp', 'Mountain', 'Forest']
+CUBE_CARDS = load_cube(sys.argv[1])
+CARDS = BASIC_LANDS + CUBE_CARDS
+CARDS_LOWER = {card.lower(): card for card in CARDS}
+
+
+def open_file_with_default(file):
+  if platform.system() == 'Darwin':       # macOS
+      subprocess.call(('open', file))
+  elif platform.system() == 'Windows':    # Windows
+      os.startfile(file)
+  else:                                   # linux variants
+      if 'microsoft' in platform.uname().release.lower():
+          subprocess.call(('wslview', file))   # WSL
+      else:
+          subprocess.call(('xdg-open', file))  # Actual linux
+
+
+def enable_autocomplete():
+  if 'libedit' in readline.__doc__:
+    readline.parse_and_bind("bind ^I rl_complete")
+  else:
+    readline.parse_and_bind("tab: complete")
+
+
+def card_completer(text, state):
+  text_to_complete = readline.get_line_buffer().lower()
+  options = [CARDS_LOWER[i] for i in CARDS_LOWER if i.startswith(text_to_complete)]
+  if state < len(options):
+    return options[state][readline.get_begidx():]
+  else:
+    return None
+
+
+def add_card(deck, card):
+  count_str = None
+  card_to_check = card
+  if card[0].isdigit():
+    parts = card.split(' ', 1)
+    if len(parts) > 1 and parts[0].isdigit():
+        count_str = parts[0]
+        card_to_check = parts[1]
+  
+  card_canon = card_to_check.lower()
+  if card_canon not in CARDS_LOWER:
+    yn = input('"%s" not in cardlist. Are you sure you want to add it to the deck? ' % card_to_check)
+    if not yn.strip().startswith('y'):
+      print('Not added.')
+      return
+      
+  add_card_with_count(deck, card_canon, count_str)
+
+
+def add_card_with_count(deck, card_canon, count_str):
+  card = CARDS_LOWER.get(card_canon, card_canon)
+  if count_str is None:
+    deck.append(card)
+  else:
+    deck.append('%s %s' % (count_str, card))
+
+
+def add_delimiter(deck):
+  deck.append('')
+
+
+def remove_last_card(deck):
+  if len(deck) == 0:
+    print('Empty deck, cannot delete.')
+    return
+    
+  deck.pop()
+
+
+def save_deck(deck):
+  file_name = datetime.today().strftime('%Y%m%d-%H%M%S') + '.txt'
+  with open(file_name, 'w') as f:
+    for card in deck:
+      f.write(card)
+      f.write('\n')
+  print('Saved deck to %s' % file_name)
+  open_file_with_default(file_name)
+
+
+if __name__ == '__main__':
+  deck = []
+  enable_autocomplete()
+  readline.set_completer(card_completer)
+  readline.set_completer_delims('')
+  
+  while True:
+    command = input('Enter card: ').strip()
+    
+    if command == '':
+      continue
+    if command == ':q':
+      print('Exiting without saving.')
+      exit(0)
+    elif command == ':wq':
+      save_deck(deck)
+      exit(0)
+    elif command == ':l':
+      print(deck)
+    elif command == ':nl':
+      add_delimiter(deck)
+    elif command == ':u':
+      remove_last_card(deck)
+    elif command.startswith(':'):
+      print('Unrecognized command "%s"' % command)
+    else:
+      add_card(deck, command)
+