If Humble Defector is controlled by a player other than its owner, and its controller leaves the game, the effect giving that player control of Humble Defector ends
Related: Top 10 Best White Black Commanders in MTG What are the best Green Black Commanders in MTG Glissa, the Traitor When a creature controlled by an opponent is removed from the battlefield and put into a graveyard, Glissa enables you to retrieve an object from your graveyard and place it back in your hand
Embercleave only technically costs that much because of its ability: it costs one less for each attacking creature you control
You may cast any card with Morph face down at instant speed, because it turns face down in the zone you cast it from, becomes a creature right there, gets Flash through Teferi's effect, and then is put on the stack
If the effect returns it from the graveyard, then of course it can only be used from the graveyard
House EDH deck, its important to add cards that let you roll dice as well as the dice-rolling payoff cards, since these shine with its abilities