Properties of the ACT-DR5 MCMF catalog. Left: redshift distribution of the three largest ICM-selected cluster catalogs to date. While RASS-MCMF provides the largest number of clusters at low redshift (z < 0.3), ACT-DR5 MCMF provides the most clusters at high redshift (z > 0.5). For the intermediate redshift range (0.3z < 0.5) eRASS1 provides the largest number of clusters. Right: richness versus tSZE-based mass of ACT-DR5 candidates and the ACT-DR5 MCMF sample. Color coded are unconfirmed candidates in gray, confirmed clusters with 0.1<f_cont<0.2 in blue and confirmed clusters with f_cont<0.1 in red.