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
Its interesting to see a playset of Guide of Souls here, given the lack of Energy synergies
But even if you can't, you can keep amassing creatures thanks to Queen Marchesas second ability
For just three mana, you can effectively Murder an opposing creature while drawing a card, gaining you both board control and card advantage
All of these things impact how many Lands youre going to have, and it means that theres often one very simple answer to finding the perfect amount for your deck
After that, your prowess with attack and defense will see you outlast your opponents