Out of four complexes of Ni, the complexes, which will be attracted by magnetic filed, are
i) [Ni(CN)₄ ]^2–    

ii) [NiCl₄]^2–      

iii) [NiCO)₄ ]            

iv) [Ni(H₂O)₆]²⁺

Both [NiCl₄]^2- and [Ni(H₂O)₆]²⁺ have two unpaired electrons. As a result, they are paramagnetic and will be drawn to a magnetic field.
All of the electrons in [Ni(CN)₄]^2- and [Ni(CO)₄] are paired. As a result, they are diamagnetic and are not attracted by a magnetic field.