The interplay of topological surface states and magnetism gives rise to unconventional transport behaviors such as the anomalous Hall effect (AHE) and anomalous Nernst effect (ANE). Antiperovskites such as Mn3SnC, which are nodal-line semimetals and exhibit concurrent antiferromagnetic (AFM) and ferromagnetic (FM) ordering, provide a fertile ground for anomalous transport phenomena. Here, we report that the anomalous transport (AHE and ANE) in this compound is predominantly governed by the intrinsic Berry-curvature effect. We establish a unified relationship between the AHE and ANE using Mott's relation. Electron scattering by both AFM and FM magnons is manifested in the anomalous Nernst signal. The ratio of the anomalous Nernst conductivity to the anomalous Hall conductivity, |α^Axy|/σ^A_xy, constitutes a sizable fraction of k_B/e, indicating a strong Berry-curvature contribution to the ANE.