The ornamental design for a reagentcard, as shown and described.
FIG. 1 is a top perspective view of a reagent card, showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof; and,
FIG. 4 is a side view, the opposite side being a mirror image thereof.
The bottom view of the design is not shown and forms no part of the claimed design. In the drawings, the two-dot chain lines represent the bounds of the claim, and all other broken lines are included for the purpose of illustrating portions of the reagent card that form no part of the claimed design. None of the broken lines form a part of the claimed design.