Theresa, Schematic Master

Partner with Nina, Blueprint Master. When this enters the battlefield, search your library for a sorcery card and put it in your hand. Whenever you cast a sorcery during your main phase, Build. (Create a 0/0 building creature token, then put a +1/+1 counter on it or put a +1/+1 counter on a building you control.)
If you control 3 or more buildings, this has double strike.