Notwithstanding possible violations of the
equivalence principle, Marvin has his work cut out for him.

The power output of the Sun is ×10 26 Watts. 2
The complete gravitational disintegration of the Earth would require an
input of energy equivalent to the Sun's total output for a continuous 5
days, 3 hours and 34 minutes. Perhaps ten days with a hyperbolic
mirror of fractional AU aperture. Place the Sun at one focus and the Earth at
the other. It won't be cheap.

One megatonne TNT nuclear equivalent is ×10 15 Joules, so
you'd need about million-billion 30 megatonne thermonuclear warheads to blow
up the planet. 13 Not even in General Curtis LeMay's wildest
dreams would such an arsenal exist, although the Earth certainly contains
enough fissionable and fusible material.

Antimatter has the advantage of total annihilation with matter, converting
200% of its mass energy to pure energy in so doing. As such, one would
require 950
billion metric tons of antimatter to do the job. One will also need a large
containment vessel and a nearly infinite supply of patience as Fermilab's
current antiproton production capacity is about nanograms per year. 14