the forums description is:
Atk +2%
[Thief]
Max HP -1%
For each 2 refine levels: you get Str +1, Atk +1%
Card effect nullifies when more than 3 cards is used.
but ingame it is just + 1 atk per 2 refine.. I tested it and it only gives + 1 atk per 2 refine.
is it a misstype in the forums and the effects ingame is the real one?