Advena, Muse of Nazara

Flying, Deathtouch, Hexproof
Landfall-When a land enters the battlefield under
your control, place a +1/+1 counter on other creatures
you control. They are now treated as Angels in
addition to their other types.
If this creature is destroyed or exiled, you can exile 3 angels from your graveyard and return this creature
to the battlefield during the end step.