For a casting cost of 1W (1 colorless, 1 White), Radiant Purge is very solid considering that Deicide from Journey into Nyx only exiles Enchantments for the same casting cost. The fact that this is instant speed removal is important and being able to hit two types of cards makes it flexible enough to perhaps see a good amount of Constructed play. In Commander, where most Commanders are multi-colored, this would seem to be a pretty solid piece of removal that would need to be watched for.
Deicide being in Standard alongside the Gods of Theros (which are also Enchantments) made sure that they stayed in check. But whereas that card has seen very little play outside of sideboards, Purge is far more versatile. It gives a bit of extra protection against the more powerful multi-colored Gods like Pharika, God of Affliction while also serving as prime creature removal. It's possible that Purge will see play in Modern, as well, where there are plenty of multi-colored creatures worth exiling, such as Keranos, God of Storms and Kitchen Finks. Radiant Purge is a solid removal card that should see a good deal of play depending on the metagame and will definitely find a home in Commander removal suites.