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Some of these are problematic with the fundamentals of the format, like Karakass ability to shut off any commander at virtually no cost, or the way Trade Secrets lets you collude with an opponent to each virtually draw your deck

I think

So, being able to guarantee you get two extra turns sounds like it would be a game-warping card that all extra turn decks should run

With that in mind, this is a good place to introduce the idea of converted mana cost or CMC

Not only do you need to be consistently attacking with your Commander or blinking it to get the most out of this enchantment, you also need a high density of legends in your deck to maximize the effect