Sometimes it prevents library-out, but that's a rare case

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A similar phenomenon can be seen with lottery tickets
You do need to deal combat damage for their trigger, but with menace that shouldnt be an issue, and as we all know, cheating on mana costs is one of the most broken things you can do in the game
Stormtide Leviathan Stormtide Leviathan is a great example of a cant attack card that limits your opponents while not affecting you as much
I also think adding replacement and redundancy commanders such as Sythis, Harvests Hand and Calix, Guided by Fate feel like a boring cop-out, especially if you already have other enchantment-matter decks