The ornamental design for a multi-tool with blade sharpener, as shown and described.
FIG. 1 is a first perspective view of a new and ornamental design for a lawn and garden multi-tool with a blade sharpener;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a first side elevation view thereof;
FIG. 4 is a second side elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines depict portions of the multi-tool with blade sharpener in which the design is embodied that are not considered part of the claimed design.