In terms of power level, most of them would sit roughly between 3 and 5 out of 10, with the more powerful ones coming from Commander 2020
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For starters, people should no longer expect to see Modern, Legacy or Commander in MTG Arena anytime soon
Decimate is strong, but it only ranks moderately among Commander's best removal spells for one simple reason: if the board lacks any of the targeted permanent types, Decimate cannot be cast at all
being able to duplicate your spells while countering enemy spells makes it a prime target the moment it gets into play, but if it's built around correctly, it can be an unstoppable asset in any great deck