Radhas first iteration never really clicked in commander, although being guaranteed a mana dork on turn 2 is an interesting concept
It's a staple in red prison decks like Mono Red Moon, but even midrange and tempo decks run it in the sideboard to punish slow or multi-color strategies
Therefore, he is deservedly high up on this list
While this effect is less desirable in constructed formats, its important for Commander
You need a lot of smaller artifacts in your deck in order to maximize Drix Interlacer, but with lots of zero-mana artifacts, like Ornithopter and Mox Amber, as well as artifact mana rocks that easily replace their mana values, like Springleaf Drum, Drix Interlacer can become a powerful payoff for the Affinity archetype
If any of these cards get reprinted, their price will definitely tank