Relic Shield is low tier compared to other Support Gold Items
Relic Shield - Melee basic attacks execute minions below 200 health. Killing a minion heals the owner and the nearest allied champion for 40 health, and grants them kill Gold.
It's a nice item, and it's on par with the gold payout as the rest of the starting support items, if used properly.
The issues is Relic Shield only pays out as much as your ADC / Team wants it to. It's completely up to your team if they want to allow you to get your gold, and heal. Relic Shield / Targon's Brace / Face of the Mountain typically goes unused as the game goes on, gold wise. The on use is fantastic.
Compared to the other two starting support items, it's very gimped. Spellthief's edge allows you to poke at your own will to gain the proc gold, along with some gp/5. Ancient Coin grants a giant area in which you can soak up gold as your ADC kills minions. Or when they just die near you. It's the freest gold of all.
I think some quality of life buffs need to come to Face of the Mountain to allow the tanky / melee supports some love with their support item.
Before we start trading it for tears.

this on the other hand is THE "low tier" support item when compared to the other GP items