I'll start by resolving the archetype name and getting the top 16 legacy archetypes simultaneously!
The overview matched to Duel Commander instead of Legacy. Let me search for the correct archetype in Legacy and fetch all 16 matchups at once.
Let me search for the archetype with different terms and look for it in the Legacy database directly.
Phelia is a white creature that blinks, and Quantum Riddler is a blue/white card. Let me look at the most likely candidates — esper blink, azorius midrange — and also search for both cards to narrow it down.
The top results are Death & Taxes (WR) and Azorius Midrange. Let me check which archetype most consistently runs BOTH Phelia and Quantum Riddler together, as the "Phelia Riddler" deck likely uses both.
Azorius Midrange is clearly the "Phelia Riddler" deck in Legacy with 54 entries using both cards. Now let me create the alias and fetch all 16 matchups simultaneously!
Now let me get the Oops All Spells matchup with correct naming, and grab sources:
Here is the full matchup breakdown for Phelia Riddler (Azorius Midrange) in Legacy over the last 60 days, sorted from best to worst winrate. Matchups with fewer than 6 decisive games are flagged as low-sample.
--- PHELIA RIDDLER (Azorius Midrange) — Legacy MU Breakdown vs. Top 16 ---
(Apr 15 – Jun 15, 2026 | mirrors excluded)
FAVORABLE
Blue Artifacts 71.4% (10-4-1, 14 decisive)
White Beanstalk 66.7% (4-2-0, 6 decisive) *low sample
Doomsday 63.6% (7-4-0, 11 decisive)
Jeskai Midrange 57.1% (4-3-0, 7 decisive) *low sample
ROUGHLY EVEN
Dimir Midrange 50.0% (3-3-0, 6 decisive) *low sample
Oops All Spells 50.0% (5-5-0, 10 decisive)
UNFAVORABLE
Tron 44.4% (8-10-1, 18 decisive)
Dimir Tempo 44.0% (11-14-0, 25 decisive)
Izzet Delver 42.9% (9-12-1, 21 decisive)
Lands 42.9% (3-4-1, 7 decisive) *low sample
Energy 40.0% (8-12-1, 20 decisive)
Grixis Reanimator 40.0% (4-6-0, 10 decisive)
Eldrazi 40.0% (2-3-0, 5 decisive) *low sample
Show and Tell 38.9% (7-11-1, 18 decisive)
Death & Taxes 37.5% (3-5-0, 8 decisive) *low sample
The picture is fairly clear. Phelia Riddler's best matchup in the current meta is against Blue Artifacts (71%), likely because the deck's disruption and tempo play answers artifacts without much friction. Doomsday (63%) is also a solid win, probably owing to Phelia/Riddler's counterspell package and clock. On the flip side, the deck struggles against the three most-played archetypes — Tron (44%), Dimir Tempo (44%), and Izzet Delver (43%) — and particularly against Show and Tell (39%), where it lacks proactive hate. Death & Taxes (37%) is a rough mirror-ish white matchup to watch, though the sample is small. Several matchups (White Beanstalk, Lands, Eldrazi, D&T, Jeskai, Dimir Midrange) have fewer than 8 decisive games so treat those numbers with caution.
Note: "Phelia Riddler" is identified in the database as Azorius Midrange (WU), the archetype that consistently runs both Phelia, Exuberant Shepherd and Quantum Riddler together (54 co-occurrences over the period). The alias has been saved for future queries.
Sources: Data from 44 Legacy tournaments (61% MTGO, 39% Melee). Recent events include:
https://www.mtgo.com/decklist/legacy-challenge-32-2026-06-1412844337
https://melee.gg/Decklist/View/e2910501-e04a-4ad7-ba52-b46700a9d0f9
https://melee.gg/Decklist/View/d77cc270-a110-4e88-867a-b4610151ed49