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Keeper of the Accord can absolutely do this on the condition it survives to see at least 1-2 opposing end steps

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It's also a great fit for Vivi Ornitier, the Final Fantasy commander with almost 18,000 decks logged on EDHREC

Here, since you have to tap to use it, and you only have 6 uses, I like it with haste in Red or equipment, untaps or haste like Thousand-Year Elixir and then after it's done, a blink effect like Momentary Blink

Whenever this creature becomes blocked by a creature, destroy that creature

The Verdict You really need some good politics and smart early play until you can let loose your storm of instants and copied spells