It's important for mechanics in Limited to be able to function well when they are contested, meaning that you can't make your deck entirely out of one mechanic
The biggest example that Wizards of the Coast usually makes is that Lord of the Rings products sold extremely well and were equally well-received by the community at large, partly because of the chase for The One Ring card, partly because of the natural fit of the IP into Magic: The Gathering
Will effect the board in a big way in just about any deck or will allow for a very strong deck to be built around it if it is a commander
We resolve the spell in due order: first Tarmogoyf is destroyed (and placed into its owners graveyard), then Krovikan Rot hits the graveyard, which changes Tarmos stats, but too late it is already dead and buried
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Introduces alternate ways to Shift a character into play atop another card