Well, it takes a lot of Arcanite. Granted, it almost has a Crusader enchant built into it... according to this site, the median price is around 40 gold to sell the plans.
An Arcanite Reaper is usually what people choose, though. Consistent damage, high-end damage, +attack power and stamina. Arcanite Reaper > Arcanite Champion in the minds of those who use them. Sorry :-(