I quote the cards' text:
You may pay up to 3 Gold. You must then roll 1 die and add 1 to the result for each Gold you paid:
1-2 You are cursed for your stinginess. Turn into a Toad for 3 turns
3-4 You are thanked for your generosity
5-6 All other characters must give you 1 of their Objects. Then discard this card.
Q: on a 5-6, who decides which Objects must be given?