While enchantment and artifact destruction is certainly the best use case for this card, Knight of Autumn can also function perfectly well as a threat through its counters
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Hope's effect turns that lifegain into mill, so even though you're not actively playing cards that mill, you're still making progress on draining your opponents of their libraries
On the other hand, for small kitchen-table playgroups where the participants know each other and can agree on variations beforehand, relaxing and tweaking (or, alternately, locking down) the Commander rule can lead to some interesting variations, almost like alternate histories
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