When enchanting items in Minecraft, the order in which you combine armor, weapons and tools with books in your anvil makes a huge difference. Each time you work on an anvil, you increase the work penalty for future workings. Once that penalty gets too high, you simply can't add any more enchantments and the anvil says "Too Expensive!". This tool helps you plan the optimal order of combining and applying books, to give you the cheapest possible cost.
Completed in under a second, trying 1,000,000,000 combinations
Total cost: 69 levels