God Forgives... I Don't! 1967

In this violent spaghetti western a murderous robber hijacks a payroll train, murders everyone aboard and then stashes his loot. A gunslinger learns about it and decides he wants the money for himself and so hatches an elaborate plot to get at it. He lures the crook into a rigged poker game, and afterward a gunfight ensues. The quick-drawing gunman makes short work of the robber, then teams up with an insurance agent to look for the hidden fortune. Unbeknownst to them, the robber had an ace up his sleeve...