Dune
What can allies pay for each other, and what can the Emperor give an ally?
Allies may pay some or all of each other's Treachery card bids and shipments. The designer ruled that only the Emperor may hand spice to an ally at any time, so the ally can use it for anything, including paying the Emperor back for cards. The Guild cannot give spice to an ally; whatever it contributes to an ally's shipment goes to the Spice Bank, while the ally's own part goes to the Guild.