Tapping into Astrality

Convoke
Whenever you gain health, you may choose to
instead have your planeswalker gain health.
Astrality behaves almost like any other aura, except instead of releasing as it's own atmospheric aura, it
flows through the current aura in the atmosphere. This
is most often unwanted by others, so Astrality is, for
the most part, held internally and tapped into directly