Heres what I dont get. If you want to have 2 seperate formats with seperate power anyway. And you dont mind releasing powerful combos into one of the format because the other, lower power format exists ... why dont you make the lower power format secondary? Keep "Eternal" as it is, the main gamemode with permanent ranked and tournament focus, and make the rotating format a secondary one, which gets less attention because it needs less attention, with still permanent ranked (because thats a minimum), but less competitive support. That sounds like it would solve every concern you bring up, while also not running into the many pitfalls of rotation that cause it to bleed players.
why dont you make the lower power format secondary?
Very reasonable question. The main reason is because eternal is aimed at being a place to preserve the greatest hits and standard is a place to make room for cool new stuff. If the new stuff has to compete with the old stuff, that's the very problem we're trying to solve with rotation. We have to either powercreep the new or heavily nerf the old to make the new cards able to compete. This results in disrupting the old decks instead of preserving them and making synergy breaks happen more often because the new cards are ecalating in power level.
Yugioh's metagame over the years is an example of what happens. The game has changed to massive complexity and power spikes as players summon huge boards on turn 1 to try and lock their opponent out of destroying everything and insta-killing them on their own first turn.
We can also look at Modern Horizons sets for an example: many players...
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