The latest DESI results, combined with CMB and supernova data, suggest evidence for evolving dark energy rather than a cosmological constant. This is interpreted as a new cosmic coincidence where the mean equation of state matches the ΛCDM model precisely in the observed window. The authors argue that conclusions about dark energy evolution are heavily influenced by prior assumptions, and this coincidence may indicate a signature of this dependence. The w0waCDM model is used to analyze dark energy evolution, with the equation of state parameter w(a) = w0 + wa(1 - a). The choice of prior ranges for w0 and wa is crucial, with uniform priors in [-3,1] and [-3,2], and the condition w0 + wa < 0 for early matter domination. The model allows for a reparametrization under a pivot scale, which decorrelates w and wa. The pivot scale corresponds to the scale factor where the data best constrains the normalization of w(a). The results show that the observational constraints lie close to w = -1, indicating a new cosmic coincidence called PhantomX, where the dark energy density reaches its maximum value within the observed window. The analysis highlights the dependence on model priors and the need for further data to assess the robustness of conclusions. The results are consistent with zero curvature and are applicable to both flat and curved universes. The study emphasizes the importance of considering prior assumptions in dark energy research and the need for more data to validate conclusions.The latest DESI results, combined with CMB and supernova data, suggest evidence for evolving dark energy rather than a cosmological constant. This is interpreted as a new cosmic coincidence where the mean equation of state matches the ΛCDM model precisely in the observed window. The authors argue that conclusions about dark energy evolution are heavily influenced by prior assumptions, and this coincidence may indicate a signature of this dependence. The w0waCDM model is used to analyze dark energy evolution, with the equation of state parameter w(a) = w0 + wa(1 - a). The choice of prior ranges for w0 and wa is crucial, with uniform priors in [-3,1] and [-3,2], and the condition w0 + wa < 0 for early matter domination. The model allows for a reparametrization under a pivot scale, which decorrelates w and wa. The pivot scale corresponds to the scale factor where the data best constrains the normalization of w(a). The results show that the observational constraints lie close to w = -1, indicating a new cosmic coincidence called PhantomX, where the dark energy density reaches its maximum value within the observed window. The analysis highlights the dependence on model priors and the need for further data to assess the robustness of conclusions. The results are consistent with zero curvature and are applicable to both flat and curved universes. The study emphasizes the importance of considering prior assumptions in dark energy research and the need for more data to validate conclusions.