Credo Masters strength lies in it's rapid summon ability to bring durable credo defenders into battle field so as long you're able to rally them (not enfeeble! Because Credo Defenders don't have natural attack)
Because the field is pretty much going to be filled of your summons (providing that you have at least 2 Credo Masters or more), all positive mass effect skills like Rally All, Protect All and Heal all will just make your deck immortal
Remember that Credo Master needs support like Bridge of Destiny, Aquatic Epicenter, Acropolis and possibly Apollo
Despite Credo Masters have fairly strong
and quick basic attack, Sycophants are going to Credo Masters so that is why I highly recommend to take some wall with you. BoD and Acropolis offers a lot but Shuddering Keep also fits here like a missing piece of puzzle. High HP wall keeps sycophants away, it weakens slowroll decks and helps your Credo Masters to finish the job. Oh, and Since Credo Master are armored and have powerful dalia proof Anti-Air, Credo Masters just own already slightly outdated Hoverpod decks
And then of course, having some intercept and Burst/Berserk in addition helps a lot... Pick Thunder Crag, Longshot (and apparition?)
In short, since you get your assaults as summon cards that have high HP and minor supporting abilities, you should pack as much mass external support as possible, no matter even if it's slow like Epicenter
Example deck (quite expensive and tough to collect:O)
E: Thread moved into correct category
