In development, the rest of the development team wasn't as excited by it as I was and didn't feel it was worthy of three cards, so they removed it from the set
Even then, it's not exciting
The win condition strapped to it is nice to play to, and is likely to make it a popular card amongst the more casual players
Now, they have removed that from older cards, and any new versions of those cards will probably also have removed that
What makes the Unlimited Starter Deck especially sought-after is the chance to pull one of Magic: The Gatherings rarest cards, as the set contains the 302 cards that made up the games previous Beta set - except with white card borders, instead of black
It doesn't cause any object to gain an ability