Include a mix of color-fixing lands, utility lands, and basic lands for a strong mana base
The deck may be a bit of a glass cannon, even if it aims to play for the long game, but I think its fair to say that Gavi can be built in any number of ways, including dedicating an even higher ratio of the deck to cycling
Others, like blacks relationship with mana acceleration, have undergone a surprising amount of change in terms of how many cards they receive with the ability to generate extra black mana and how comparatively restrictive they are versus a card like Dark Ritual, one of the first and strongest go-tos for mana acceleration during Magics early years
If theres three or more counters, you can put big creatures onto the battlefield for free
Standard is similar to Magics version, including the four most recent sets with rotation each year