In practice, it isnt that hard to play them both together because you can usually find a third colored source to get it onto the battlefield, or enough pips early to use Nykthos for three colored mana, or else its just powerful enough with the three extra pips to be worth that minor inconvenience
A must-include in any deck aiming to go long and stay strong
Cards with basic landcycling can get Plains, Island, Swamp, Mountain, Forest, or Wastes, plus their snow-covered land counterparts
Bristly Bill, Spin Sower allows you to pay 3GG (three generic mana and two green) to double the number of +1/+1 counters on all your Creatures
For other purposes, however, if a card refers to your commander, it means either the legendary creature or the legendary Background enchantment
For that price, you gain life equal to the number of creature cards in your graveyard