"Magic" is the degree to which a state cannot be approximated by Clifford gates. We study mana, measure of magic, in ground $\mathbb Z_3$ Potts model, and argue that it broadly useful diagnostic for many-body physics. In particular we find $q = 3$ has large mana at model's critical point, this resides system's correlations. explain form simple tensor-counting calculation based on MERA represent...