This not only doubles her damage for whatever poor soul you decide gets to die via commander damage, but also doubles the amount of Monks you get to put down, all of which have prowess as well
One of the longstanding tricks in the format is to play Karmic Guide alongside Saffi Erikdottir so that you can put the echo trigger on the stack and then sacrifice Saffi, eventually bringing back Karmic Guide (since, in your Karador deck, Saffi is cheaper to cast)
That being said, I think its slightly better than Deadly Dispute because it costs one mana instead of two, which can make all the difference in a game
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Its a unique stax piece that can basically shut down combo or spells decks for a turn
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