Even the flavor text underwent this process. Here's the original Soul Feast from Urza's Destiny:
As no one has ever accepted a second invitation to Davvol's table, the evincar often dines alone.
That's good, but it's too world-specific for Starter 1999. So it was boiled down to its essence:
Evil often dines alone.
When Soul Feast moved into the core set with Seventh Edition, it got another spin, moving away from the lonely-archvillain theme:
You are who you eat.
This art and flavor text stayed until Soul Feast's most recent incarnation in Tenth Edition, when the vampire art got a more specific description:
"I smell the tang of a mortal's fresh blood. I hear it sliding wetly beneath its skin. My hunger cannot refuse the invitation." —Yuri, Sengir vampire
Finally, the flavor has come full circle, with a named character appearing in the flavor text. Neat!