hmm, I do not agree that the cloudgoat is comparable to elspeth. Thing is: there is more creature removal (con for the goat), cloudgoat is a one trick pony (but blink power!). Elspeth makes tokens and stays alive, let alone the agency that elspeth gives. Yes you can attack elspeth, but you can choose to guard her.
Cloudgoat Ranger gives you a 3/3 you can make into a dragon in addition to the 3 1/1s! Pretty comparable to Elspeth, and that was a change I looked to make back in the day.
Planeswalkers are often value machines, clocks, and answers in one (and do not need other cards to shine). The goat is just a clock spread over bodies.