These cards squeeze all that card draw into a tight window that chokes your opponents out of options
[226] They later released an expansion Battle for Zendikar featuring multi-color Planeswalkers Kiora and Ob Nixilis and a colorless Eldrazi Ruiner, and a second master set Shadows Over Innistrad which has 4 new Planeswalkers and also includes the addition of cryptoliths
Nasty combo of blockers, and they are brilliant in all kinds of archetypes
If I was going for a more high-power build, there are better options
Thats why the price is what it is
For example, the last ability will count experience counters that you got from the second ability, from another ability, from another copy of Aang, Airbending Master, and so on