pot of gold
the realization of all one's hopes and dreams; ultimate success, fulfillment, or happiness: to find the pot of gold at the end of the rainbow.
a sudden, huge windfall; sudden wealth: Your only chance for a pot of gold is to win the lottery.
Origin of pot of gold
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019