Agieluma I'm playing as Ajax myself and currently (first season) he has made 24 appearances and has scored 25 goals. I'm at work so I cannot show a screenshot, but he's certainly worth the 12m!
EDIT: If you buy him, play him as an AF or a CF, best roles in my opinion. Also, if you don't fancy paying the price for him, look at Fierro (Mexican) I think he's available for around 6m