Relic Shield and Spellthief's Edge
I don't have concrete statistics to back this up, but I've been noticing in games that Relic Shield and Spellthief's Edge both lag behind Ancient Coin in therms of gold accumulation and speed.
It usually takes me over 10 minutes to get wards from Frostfang or Targon's Brace, even when poking all charges or proc-ing Spoils of War as soon as they're up, and upgrading them immediately at 375 or 350 respectively. Ancient Coin, when recalling as soon as I have 350 gold, completes the gold quest in under 8 minutes, sometimes even sooner.
I'm ordinarily not one to complain, but I do feel like Spellthief's could benefit from 4 or 5 charges to begin with, and Relic starting with 3. This at least balances gold income to the needs each item accommodates, and allows for more equal footing in therms of completing the Gold Quest.