Sotha Sil, Tribunal Artificer

Partner 2 (you may have three commanders if all
Three have Partner 2)
When Sotha Sil, Tribunal Artificer enters the battlefield, sacrifice it unless you control a card called, The Heart of Lorkhan.
You may cast cards from your graveyard, if an
instant or sorcery were put into your graveyard,
exile it instead.