The match-level query returned zeros, which means the matches table links via entry_id but may need a different join path. Let me try pulling match data directly.
Here is the breakdown across all Broodscale (Modern) tournament entries in the database:
With Ugin's Labyrinth: 362 entries, 852 wins, 734 losses, 68 draws. Winrate (excluding draws): 53.72%
Without Ugin's Labyrinth: 1,197 entries, 2,624 wins, 2,491 losses, 242 draws. Winrate (excluding draws): 51.30%
Broodscale lists running Ugin's Labyrinth outperform those without by about 2.4 percentage points. The card appears in roughly 36% of Broodscale lists (58 of 163 decks in the recent window) and is almost always played as a near-playset at ~4 copies. The correlation likely reflects both the card's mana-acceleration upside for casting Emrakul and the fact that players adopting Ugin's Labyrinth tend to be on a more optimized, focused shell, but the data consistently favors the version running it.
Sources: Data drawn from 80 Modern tournaments (69% MTGO, 31% Melee). Recent examples: Modern Challenge 32 (2026-06-14) https://www.mtgo.com/decklist/modern-challenge-32-2026-06-1412844334, NYX Game Arena Store Qualifier S13 (2026-06-14) https://melee.gg/Decklist/View/37dec019-e43b-4b11-8328-b468012d8da4