Evocator Spellskite

Magecraft — Whenever you cast or copy an instant or sorcery spell, Evocator Spellskite gains flying until end of turn. If this is the fourth time this ability resolves, instead proliferate.
These flocks roam the skies searching for confluences of Animus, and their gleaming feathers are awash with the soft glow of the primordial energy on which they feed.