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Guff Rewrites History has an inherently powerful effect, but I dont think it is going to replace Chaos Warp as a Commander staple

For examples Lightning, Security Sergeant needs to remain on the battlefield, Grolnok, the Omnivore can only add croak counters if the card went directly from the library to the graveyard (usually because it was milled), and Kaya the Inexorables emblem only triggers at your upkeep and looks at legendaries

But since it also gives you the ability to cast Divination when its convenient and turn cards drawn into +1/+1 counters, Id say its quite the catch

You will gain 2 life that many times