Good, I have the archetype ID and card ID. Now let me query the database to split performance with vs. without Shared Roots in the main deck, and also check copy counts.
Hey @Zacktrack92, here's the data breakdown across 1,315 Mono Green Landfall entries in Standard:
Versions WITHOUT Shared Roots in main (1,149 entries): 52.93% winrate.
Versions WITH Shared Roots in main (166 entries): 52.43% winrate.
The difference is essentially negligible -- barely half a percentage point in favor of the no-Shared-Roots builds. There is no statistically meaningful winrate advantage to running the card mainboard.
Among the 166 players who do run it main, the average is 2.36 copies. The most popular count is 2 copies (105 entries), followed by 3 copies (50 entries), and 4 copies (7 entries). Very few run just a single copy (4 entries). So if you are going to include it, 2 copies appears to be the community consensus.
Sources: Data from 1,315 tournament entries across 39 events. Approximately 79% MTGO, 21% Melee. Recent examples:
https://melee.gg/Decklist/View/ffd56c98-ac57-46b6-955c-b4c400f1eb05
https://melee.gg/Decklist/View/25afe694-3a8a-492f-8741-b4c400d2d98b
https://melee.gg/Decklist/View/fdbb1bef-54b8-4db8-a3f6-b4c3012c32ca