And this is why this game will never be successful, if errata is based on popularity and not actual power level. Did any of idiots responsible thought even for a moment that Verlaat and Miffy are popular because:
1. they're actually good refess cards and refess players finally can play their favourite sphere without losing most of time,
2. they're high rarity free cards,
3. they fill important role in mid refess and can't be replaced,
and not because they're actually powerful? Seriously, Miffy gets errata but Dio is still considered fine? Verlaat, also called Refess Bringer, gets hit after few weeks, while Ryu can still hit twice for 60+ dmg and original Bringer waited months for much less significant nerf and then year or so for second one?
Just because you have your graphs you made in Excel doesn't mean you know squat about balancing game. First learn how to analyze data, then use it as base for your decisions. WotC balances cards based on power level, not popularity. Just look at Geist or Delver; they were everywhere, people complained, no ban followed. Nerfing popular cards just because they're popular is plain retarded, you don't weaken balanced cards that people enjoy playing if you want them to keep playing. Unless they generated HUGE RP gain (which they didn't, not compared to Dio/Emana/Mystere/EN/any other OP BS anyway) leave them alone. And maybe learn why they're popular and then buff other to fill similar roles.