Here's the weapon skin that got the final kill at every international event so far:
Masters Reykjavík #1: Sovereign Stinger (variant unclear)
Masters Berlin: Elderflame Operator (blue variant)
Champions 2021: VALORANT GO! Vol. 1 Phantom
Masters Reykjavík #2: Champions 2021 Vandal
Masters Copenhagen: Prelude to Chaos Vandal (blue variant)
Champions 2022: Protocol 781-A Phantom (green variant)
LOCK//IN São Paulo: Champions 2022 Phantom
Masters Tokyo: Oni Phantom (blue variant)
Champions 2023: Gaia's Vengeance Vandal (blue variant)
Masters Madrid: Kuronami Vandal (white variant)
Masters Shanghai: Primordium Vandal (blue variant)
Champions 2024: Forsaken Vandal (green variant)