Personal opinion: Looting isnt worth spending extra mana on in Commander, so the Gateways not really getting there on its own, and the threat of this flipping is enough to attract the attention of your opponents
What Intervention does is it plays well to the way that Standard aggro decks tend to work
Once it swings in, you get access to the top card of your library, which makes it much easier to keep the pressure up
Here's the reminder text for discover: "Discover X (Exile cards from the top of your library until you exile a nonland card with mana value X or less
Lumra, Bellow of the Woods Lumra, Bellow of the Woods provides self-mill decks with a top end that combines ramp with a massive body to propel yourself forward at an alarming rate, and it even fuels itself
The VSTAR ability, which allows you to return several energy cards to the deck, can turn the tide of battle