Deities embody specific aspects of the world. They are not human and shouldn't be ascribed human behaviors. The god of agriculture isn't just focused on farming. He IS farming.
He will be watching over every farm in the world for potentially tens of thousands, hundreds of thousands or potentially millions of settings. He will be simultaneously watching over every cleric in those settings, as well as watching non-cleric worshippers(many more than the clerics), and listening/watching those who don't worship, but mention or entreat him. Those last will involve almost everyone who needs food and is from a farming culture. They will periodically call upon him or talk about him.
What he doesn't give a fig about is any card that isn't going to affect farming. He's not going to care if a cleric pulls good cards or bad ones, because even if the cleric pulls a very bad one and dies, that clerics soul goes to dwell with the god and permanently increase the god's power. He's probably answer once, because the cleric of 9th level or higher does have some favor, but being used over and over and over as a fortune teller for the cleric's greed isn't going to sit well.
There could always be exceptions. A cleric of a god of greed might just be able to get away with something like that. A trickster god? If I were the cleric of a trickster god, the last thing I'd do is ask him for advice on cards that could be both really good and really bad. The gods nature is trickery. At least for myself. If I were going to trick someone else drawing cards, the god would probably be very on board with that.