Looks like a nice main-deckable replacement for New Sigarda that you can Evolve into straight from your 2-drops. The hexproof fills the same role of protecting you from Burn, Discard, and Storm while also protecting Saheeli and the rest of your creatures. It does die to Push, though. It's also a mana sink to help against flooding or even act an outlet for the Druid combo. And a 3/4 flyer for 4! Really awesome card for the deck!
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3W - Legendary Creature Angel
You, planeswalkers you control, and other creatures you control have hexproof.
4GG: Put a +1/+1 counter on each creature you control.
Sigarda replacement for the deck perhaps?