Let me start by looking up the Dimir Tempo archetype and getting the Modern format details. Since this is a Legacy question, let me pull the right data!
Good, I found the archetype. Now let me search for the Moonshadow card and look at the archetype cards to understand what differentiates the two builds, then compute winrates with and without Moonshadow.
Moonshadow is in 73.68% of Dimir Tempo decks (28 out of 38). Now let me query the database directly to compare winrates of decks WITH vs WITHOUT Moonshadow over the last 2 weeks.
The match-level query returned zero wins/losses — the matches table might store results differently. Let me check the structure and try aggregating from tournament entry records directly.
Results are stored as 'WIN'/'LOSS'/'DRAW' (uppercase). Let me redo the comparison correctly.
Clear results! Let me grab sources to support this.
Here's the breakdown for Legacy Dimir Tempo over the last 2 weeks (Sep 21 – Oct 5):
| Build | Matches | Wins | Losses | Winrate |
|---|---|---|---|---|
| Without Moonshadow | 32 | 20 | 12 | 62.5% |
| With Moonshadow | 100 | 43 | 56 | 43.4% |
No — the Moonshadow build actually performs significantly worse against the full meta (mirrors excluded). The non-Moonshadow builds are putting up an impressive 62.5% WR vs. the Moonshadow build's 43.4% — a gap of nearly 19 percentage points.
A few caveats worth noting:
Sources — Data from 18 Legacy tournaments (66.7% MTGO, 33.3% Melee):