Like most Magic: The Gathering cards, the value of Countless Gears Renegade depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Aether Revolt)
at most points in the last 23 years you could find one for sale if you looked around, and the trade value for a copy has usually been around the ballpark of a full Unlimited P9
The fact that this card has Plot, an ability that it doesn't really need to be playable, is egregious
There may be more power lurking in the depths further up this list
Investment Tip: When investing in EX Deoxys, focus on acquiring Gold Star cards in the best possible condition, as these have shown the most significant value appreciation
In fact, Commander features many situations where being able to cash in your current permanents for any return is a win