Mara, Owlbearer of Brück

Magecraft —Whenever you cast or copy an instant or sorcery spell, create a 1/1 green and white Bird creature token with flying.

As long as you control eight or more lands Mara, Owlbearer of Brück gets flying and +1/+1 for each Bird you control.

The owls carry her vision to the skies, her courage to the battlefield, and her mercy to the wounded.