Titania

Titania was the Maro-Sorcerer for the lush forest of Argoth, which was attacked by both sides for supplies at the end of the Brothers' War. By some she was considered to be a goddess. She was weakened due to the excessive plundering of the forests by the brother's armies. She tried to negotiate with both brothers, but they wouldn't leave. She then led the permanent offensive against both armies, leading to the extinction of the most of the lifeforms in Argoth. She eventually perished after Urza activated the Golgothian Sylex during his final battle with Mishra.

Trivia

 * The name "Titania" is also a reference to the faerie queen in Shakespeare's A Midsummer Night's Dream, and thus one of several real-world references from the prerevisionist period.