Gary loves big board states, where you've filled your board with lots of black cards and have a high devotion, but that isn't completely necessary for him
Being able to remove whatever nonland card for just one mana and two life is really key: you can play it on turn one to map whatever your opponent is doing, you can delay it to snipe a Lurrus or to jam your combo immediately Its hard to say how much I love this card and how much I think its an egregious design
Rituals like Dark Ritual help you get to your second spell quickly, Clockspinning supports your suspend cards which are another way to cast spells without paying the mana that turn
The Bad I feel like this deck is nerfing itself so that Y'shtola, Night's Blessed doesn't curbstomp all the other precons
In a 40-life format, this is essential in colorless, one and two color decks all day long, especially ones that don't get good reliable card draw like Red, White and Green
For 4 ink, you get a 1/4/2 with Rush