I can see there are multiple Initiative archetypes in Legacy (Boros, Gruul, Naya, Mono White, Mono Red). Let me check all of them against Doomsday, and also consider "IC" might mean "Initiative Control" as a broader category.
The 15-day window is returning zero matches for all Initiative variants. Let me widen the window and also check what's actually happening with Doomsday matches in Legacy recently.
Hey @oEltinho! Here is what the data shows for Doomsday vs Initiative Control in Legacy over the last 15 days (Apr 13 - Apr 28).
The short answer: there are zero recorded Doomsday vs Initiative matchups in that window. None of the Initiative variants tracked in Legacy (Boros, Gruul, Naya, Mono White, Mono Red) appear in Doomsday's match results during this period. Doomsday does have 39 recorded matches across 9 tournaments, but its opponents were primarily Mystic Forge Combo (6 matches), Show and Tell (5), Dimir Tempo (5), and Energy (4). Initiative simply did not show up as a meaningful opponent in the data.
This most likely reflects the very low meta presence of Initiative archetypes right now in Legacy, which means there just weren't enough cross-pairings to generate reliable matchup data in a 15-day window. If you want a more statistically meaningful sample, I'd suggest widening to a 60-90 day window, though even then Initiative's Legacy meta share may be thin enough to limit confidence.
Sources: 9 tournaments tracked (Apr 13-28), 78% MTGO / 22% Melee.