Dune
If Richese helps an ally pay for a card, where does the spice go?
Richese's own portion goes to the Spice Bank (the latest designer ruling, which replaces his earlier posts sending it to the Emperor), while the ally's portion goes to Richese. Payments are simultaneous, so Richese can't use the ally's spice to pay its share. In a silent auction the two must agree the amounts so the ally doesn't overbid.