The ornamental design for a memorabiliaballsimulacrum, as shown and described.
FIG. 1 is a perspective view of a memorabilia ball simulacrum;
FIG. 2 is a front view of the memorabilia ball simulacrum;
FIG. 3 is a rear view of the memorabilia ball simulacrum;
FIG. 4 is a side view of the memorabilia ball simulacrum;
FIG. 5 is a bottom view of the memorabilia ball simulacrum; and,
FIG. 6 is a perspective view of the memorabilia ball simulacrum in a stand.
The broken lines in FIGS. 1, 2, and 6 representing an autograph, and in FIG. 6 representing a stand show environment, and form no part of the claimed design.