The "UR" archetype didn't resolve to the right deck โ let me look for UR-specific archetypes across formats.
Eddymurk Crab shows up as a key card in "Izzet Midrange" in Legacy. Let me also check Modern for UR archetypes containing the crab, and then run the winrate-by-crab-count query.
No results yet โ let me check whether the crab is actually in the deck_cards table at all, and broaden the search across all formats.
The crab is primarily a Standard card. The biggest UR archetypes with it are Izzet Prowess and Izzet Spellementals. Let me now run the winrate-by-crab-count query for these two Standard archetypes.
Here is the winrate breakdown for Izzet Prowess (Standard) by Eddymurk Crab count, covering the last two months:
Izzet Prowess - Eddymurk Crab count vs. winrate (since late Feb 2026):
1 copy: 52.0% (86 entries, 279W/258L)
2 copies: 53.5% (276 entries, 774W/673L)
3 copies: 56.4% (80 entries, 297W/230L)
4 copies: 54.5% (62 entries, 140W/117L)
The trend peaks at 3 copies with a 56.4% winrate, slightly edging out the full playset (54.5%). The most commonly played configuration is 2 copies (276 entries), which posts a solid 53.5%. Running 1 copy comes in lowest at 52.0%, suggesting that at least 2 is worth the slot.
For reference, Izzet Spellementals (the other major Standard UR archetype with the crab) runs it exclusively as a 4-of and sits at a more modest 50.5% (366 entries), meaning the Prowess shell appears to extract more value from the card regardless of count.
The sample sizes at 3 and 4 copies are smaller, so the 3-copy edge should be taken with some caution, but the data does hint that maximum copies may come with slight diminishing returns compared to a 3-copy flex configuration.
Sources: Data from 116 Standard tournaments since Feb 28, 2026 (64% MTGO, 36% Melee). Recent events include:
https://www.mtgo.com/decklist/standard-challenge-32-2026-04-2612840574
https://www.mtgo.com/decklist/standard-challenge-32-2026-04-2512840554