A quick search turned up a promising open-source project (mtgrender Describe the world, key factions, prominent creature types, mechanical themes, potential synergies, and supported play styles
Flesh Duplicate Flesh Duplicate is awesome in decks that want to Clone their own creatures for cheap, either because they have strong ETB effects or because youre copying legendary creatures like Keiga, the Tide Star that you actively want to die
It means when you need it you have more effective copies but when you don't it isn't nearly as harmful as it would be in most other lists
Its a trump card that red mages have up their sleeves, so when ones defenses are too strong, theres nothing wrong in shifting the defenders loyalty to favor you even if thats just for a few phases
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Of course, back when there was no other way to get land, very few people minded