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Umori doesn't actually provide you with any real choic - you have to name Creatures or you're restricted to Pharika as your commander and enchantments as your card type

While there are no other ways to remove rad counters from yourself , there are a few cards which will cause you to benefit from accumulating rad counters

III Return target Assassin creature card from your graveyard to the battlefield with an additional +1/+1 counter on it

There is rumored support for prizes

This is one advantage I'd give Temple Bell over Horn of Greed, but if your deck has a means of removing the horn easily when you're ahead then they'll both work great especially if you're operating a deck that can easily fly under the radar of your opponents