They mutate into the creature on top plus all abilities from under it.) Double strike Whenever this creature mutates, it deals 4 damage to target creature or planeswalker an opponent controls and you gain 4 life
That's just good for the answering of dorks, especially the middle and last since they don't exile, they won't shut down decks that need to go wide without the ability to come back
So, at least there's that
Winter Sky Which do you want
Before this change, Wizard Mentor was a first pick card which could save your creatures from creature kill spells, allow you to reuse the bevy of 187 creatures in the format (Ghitu Slinger, anyone?), and at worst case scenario allow you to play emergency defense
As a bonus, Aetherwing can potentially be a cheap but potent aerial swinger, since the cards color identity could easily set up its required power boost and the ETB token immediately becomes its first crew target