Orazca Relic

Ramp that refuses to rot in your hand once ramp stops mattering. On turn three it taps for a single colorless mana and asks nothing else of you, a plain accelerant while your board is still assembling. The sacrifice mode stays locked until you control ten permanents and pick up the city's blessing, at which point the same rock cashes out for three life and a card. That gate is the entire trick: an artifact that gained life and drew on demand would cost more or do less, but pinning the refuel to a wide board means the reward lands precisely when a go-wide deck no longer needs the acceleration it provided. Ascend, as a mechanic, wants you to accumulate and spread out; this rewards exactly that pattern and hands over a modest draw as the finish. As a mana source it is nothing special. As a mana source that converts into a second card instead of sitting dead in the late game, it does something most colorless rocks at its rate never attempt. The design idea worth noting is the conditional sacrifice: one permanent carrying two functions, where the second unlocks itself as a consequence of the plan you were already running.