I'll analyze the performance of Izzet Lessons with and without Monument to Endurance in Standard over the last month.
Izzet Lessons (labeled as Izzet Midrange in the database) performs significantly worse with Monument to Endurance. Over the last month, the archetype has a 56.2% winrate without Monument across 42 entries (113-88 record), compared to just 20.0% with Monument in the single entry that ran it (1-4 record). The sample size with Monument is extremely limited, but the overwhelming preference among successful pilots is to exclude the card entirely.
The core Izzet Lessons strategy focuses on efficient spells like Stock Up, Into the Flood Maw, and Ral, Crackling Wit. Monument to Endurance requires a dedicated discard engine to generate value, which doesn't align well with the archetype's instant-speed interaction and card advantage plan. The 3-mana investment competes with more impactful plays in that slot.
Sources
Data from 23 tournaments: 65.2% MTGO, 34.8% Melee. Recent events include:
https://www.mtgo.com/decklist/standard-challenge-32-2025-11-1512824425
https://www.mtgo.com/decklist/standard-challenge-32-2025-11-1512824421
https://www.mtgo.com/decklist/standard-challenge-32-2025-11-1412824412