You are truly immortal now. You have no need for a form at all and can survive it's complete destruction. You will need mana to reform them however. As a being of pure magic and will, you are more tied into the flow of mana and can use it to easily track magic or see how spells are formed.
Eternal Angles
No longer restricted to locations on planes, you can materialize within the blind eternities itself. While this is potentially useful academically for assessing a plane externally, it also allows you to intercept another planeswalker with enough skill.
Containing Multitudes
Your Summons are as much a part of you as the mana they’re formed from, allowing you to instantly sacrifice them and return their mana to you. Should they die or be removed by other means, this still applies.
Worldsoul
Understanding both the birth of planes, and the secrets of the Soul, you can dictate the worldsoul of any plane you create. The worldsoul is the essence of a plane, and reflects the plane as much as the plane reflects it. While designing the worldsoul won’t determine everything of the plane’s nature, it will cement a starting point.