What is the mood and tense of Qui l'eût cru?
Alan and Chris are both correct that it is Le Conditionnel Passé - deuxième forme - which is rarely used - and it can be replaced by Le Conditionnel passé : Qui l'aurait cru ?
Take a look here: https://lecritdentreprise.com/qui-leut-cru-ou-qui-leut-cru/
I hope this is helpful.
Bonne journée !
Grammatically, it is conditional mood, perfect tense: Who would have thought? Or "Who would have thunk" (tongue in cheek).
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