The ornamental design for an electronic tentcard with flexible display, as shown and described.
FIG. 1 is a front view of an electronic tent card with flexible display showing the new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top side view thereof;
FIG. 6 is a bottom side view thereof; and,
FIG. 7 is a perspective view of front top and left side thereof.
The shade lines in the Figures show contour and not surface ornamentation, the broken lines in the Figures show portions of the electronic tent card with flexible display and form no part of the claimed design.