I can’t help you there yet, at least not entirely.
I’ve only seen footage of floors 1-6, out of 20 total. So i simply don’t know everything you’ll have to counter.
Another main factor is team competition, as i simply don’t know how effective other classes can be here either. (Aside of chronomancers)
It may very well be that a proper tank is more then enough in terms of defense, meaning a cleric will want to focus on healing and damage. (After all earth tower is time based)
Or they may need specific cleric defensive skills, as we got some of the strongest defenses. (for example stone skin, barrier, carve world tree, goddess ausrine or sterea trofh.) Or even oracles may be needed for their counter-spell, which is not that unlikely given imc’s quirks in dungeon design.
I would however say that a few builds stand out as very good options:
[Obvious Warning: This is mostly speculation]
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One of the paladin builds. Barrier is excellent vs melee enemies and paladin can reduce magic dmg taken. Oracle can block spell dmg even, PD has more healing and condition removal. + bonus cd reduction or res.
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Any dievdirby3 build, esp the druid2. Since silence and invulns work against every type of damage, and they should deal good damage alongside it. But are weak to conditions and reversi.