Talk:Smithing/@comment-123.21.113.16-20150614071313/@comment-26488375-20150615000040

You add what ema you want to use when you input the recipe for your smithing, and it is consumed while giving you a CHANCE of rarer card, more expensive/rare ema gives more increase for rarer cards.

But it's still only a chance, even the most expensive Ema can still give you 1:30 and the cheapest one might give you Kogi/Jiji.