I just had an article go up on PureMTGO that talks about the history of removal. In that article, I recorded every removal spell in expert level expansions for the past 15 years, and then ran the numbers.
One of my goals with this blog is to give more in depth information to my readers. To that end, I’ve also included a public link to to the spreadsheet where I have processed the numbers for this article. This does not include all the hard data for the removal spells, just because those are on several different spreadsheets, and I’m trying to figure out the best way to make those available. For now, feel free to check out the chart with the processed results and do with it what you will.