Turning a random thrull into 2 colorless or 1 colored mana gives you all the ramp you need to make your deck function while stacking invaluable triggers from your sacrifice payoffs
Ardbert, Warrior of Darkness* For your local legendary creature deck, Ardbert is going to become a member of the gang if they have enough white/black spells to support it, and a staple for lower-powered Ratadrabik decks that are willing to play fair
You can also trigger it on your own with spells such as Path to Exile or Winds of Abandon, even though it only gets one land per turn
Right now its double, could go up, could go lower
Many energy cards are primarily designed to be one or the other, and exploiting the differing rates of returns between them using the efficient generators to fuel the powerful outlets is a big part of deckbuilding around this mechanic
It can be used at instant speed and circumvents most counterspells or stax pieces because you are not casting the cards