Good, I have the meta overview. Now let me check the key matchups for the most promising candidates against both Death & Taxes and Eldrazi. Lands, Aluren, Azorius Midrange, and Doomsday stand out as non-UB-tempo options with good winrates. Let me check their matchups.
Lands is the clear winner on both matchups. Let me now get its overview and recent key cards to give a fuller picture.
Here is the data-backed recommendation for @JurgenKowalsky:
Lands is your best pick for this local tournament. Over the last 60 days in Legacy, Lands posts the strongest target matchup numbers of any non-UB-tempo archetype: 55.6% vs Death & Taxes (10-8, 19 matches) and a dominant 75.0% vs Eldrazi (3-1, 4 matches). Its overall format winrate (excluding mirror) sits at 56.0% across 275 matches, making it the highest-winrate deck in the top half of the meta, ahead of even Doomsday and Azorius Midrange.
The other candidates fell short. Doomsday wins the Death & Taxes matchup at 55.9% but loses to Eldrazi at 42.9%, which is a direct liability given your stated field. Aluren is negative vs Death & Taxes (46.2%) and only slightly positive vs Eldrazi (55.6%). Azorius Midrange is negative vs Death & Taxes (44.8%), so it does not meet your criteria. Lands is the only archetype in the top 15 of the meta that beats both target decks and carries a strong overall record.
The archetype is anchored by a full playset of Exploration, Crop Rotation, Urza's Saga, and Malevolent Rumble, plus The Tabernacle at Pendrell Vale, Life from the Loam, and Yavimaya, Cradle of Growth. Tabernacle is the engine that demolishes creature-heavy decks like Death & Taxes and Eldrazi, while Saga and Loam provide resilience against the rest of the open field.
Sources: Data from 47 tournaments (70.2% MTGO, 29.8% Melee) over the last 60 days.