1.4 GHz radio power vs. mass (M₅₀₀) plotted for El Gordo (this work and L14) with other samples of radio halos from the literature. The Di Gennaro et al. (2021a) sample consists of halos at redshifts > 0.6, the Knowles et al. (2021) contains radio halos in the redshift range of 0.22 < z < 0.65 and the local redshift (z ∼ 0.2) sample from Cassano et al. (2013). The recent discovery of the radio halo in ACT-CL J0329.2-2330 (z = 1.23) is also shown (Sikhosana et al. 2024). The large samples from the LOFAR survey by Botteon et al. (2022) (0.016 < z < 0.9), and from ASKAP by Duchesne et al. (2024) (0.01 < z < 0.5) have been added to provide a more comprehensive picture.