The meta report shows "broodscale" as the top archetype and there are Eldrazi-related archetypes. Let me get more details on broodscale matchups, and also check the Eldrazi archetypes. The user mentions "broodscale/monogeldrazi" as one combined concern - let me check matchups for the top performers against broodscale and fight rigging eldrazi.
Good. Now let me get the matchup winrates for the top performing archetypes against both broodscale and fight rigging eldrazi simultaneously.
Here is what the data says, @SanctisPie21634.
Broodscale and Fight Rigging Eldrazi currently sit at 11% and 3.6% presence respectively in Modern over the last 30 days, totaling roughly 14-15% combined. Your 25-30% projection for a Regional Championship field is ambitious but not unthinkable given how star-player clustering works at large events. Based on actual matchup data, here are the clearest recommendations:
Devoted Combo is the standout answer. It posts a 57.5% winrate vs Broodscale (193 decisive matches) and a dominant 71.9% winrate vs Fight Rigging Eldrazi (64 matches). It also carries a healthy 51.9% overall winrate in the format, meaning you are not sacrificing your other matchups to prey on the green Eldrazi decks. This is the cleanest metagame call if you expect both variants to be heavily represented.
Esper Blink is a secondary option worth considering. It beats Fight Rigging Eldrazi at 59.1% and has a passable 53.1% overall winrate, though it struggles against Broodscale specifically (47.0%). If the field skews more toward Fight Rigging Eldrazi than Broodscale, Esper Blink is fine, but against the dominant Broodscale build it is slightly unfavored. Decks to avoid: Living End is catastrophic vs Broodscale (35.3%), Affinity gets crushed at 36.7%, and Boros Ponza is also badly positioned at 36.2%. Azorius Control is negative against both Eldrazi archetypes. Goryo Reanimator is merely slightly negative vs Broodscale (45.1%) and positive vs Fight Rigging (56.5%), making it a middle-of-the-road choice.
TL;DR: Devoted Combo is the data-backed pick if you want to target both Eldrazi decks simultaneously. It wins the matchup against both while remaining competitive across the rest of the field.
Sources: Data from 102 Modern tournaments (Sep 22 - Aug 22, 2026), 55.9% MTGO / 44.1% Melee.