The ornamental design for a creditcard with multiple magnetic strips, as shown and described.
FIG. 1 is a front elevation view of a credit card with multiple magnetic strips showing my new design, the opposite side being a mirror image of the shown;
FIG. 2 is a right elevation view thereof, the opposite side being a mirror image of the shown;
FIG. 3 is a top plan view thereof, the opposite side being a mirror image of the shown; and,
FIG. 4 is an isometric view thereof.
The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design.