Llanovar Wastes + Yavimaya Coast. Switch to Shivan Reef against a Green opponent.

Never A1. Sometimes you can just A3 and win, especially since A3 counts as Casting creatures and thus Summoning as well. Otherwise A2 for Summoning creatures and to make enough black for A3 and green for Gather the Pack. Overwrite the Priest if you are really low on life, perhaps, otherwise you will probably want to cast him again and just overwrite or refuse the Demon.