I think the idea is to build up thematics of divine theft in order to invoke an opportunity for the Night Prowler; sort of using the physical objects as channels into the treasure stores of the god they belong to, so to speak? And part of that general idea is that it'll work better on gods that actually have treasures as part of their identity, and of those Hashut is a dark god of riches and greed, which Ranald pretty firmly opposes, so if there's any god with a big pile of treasure it'd be Hashut.
(A benefit of the plan might be events in the warp mirroring the reality of the events; rather than a fair gamble or fight between our friend and an evil iron statue that can breath fire, through the aspect of the gambler, it'd be superlative skill versus dwarven security and chaotic paranoia, which would give us more opportunities to stack the deck.
Or, to put it another way, rather than a god versus god gamble, it'd be conducting a ritual to steal divine power from Hashut conducted through the conduit of just actually stealing divinely powered things from Hashut. No clue if that would be plausibly something we could pull off, but it would be neat if it were. Plus, empowering Ranald through his different faces could give us ideas for other things we could do to empower him, rather than the Gambler being the only one that can win big.)
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