- “Spend” refers to any ability that allows a player to choose to pay gold or move gold from his or her gold pool. This includes paying costs and moving gold for bestow. (Source.)
During the marshaling phase, you may spend gold on The Iron Bank as if it were in your gold pool.
Reaction: After you collect income, move X gold (to a maximum of 5 gold) from the treasury to The Iron Bank. X is the number of gold on The Iron Bank.