Painful interview with "yo-yo pro" Kenny Strasser from Doctor Popular on Vimeo.

Examples:

He can summon the power to transform himself into a more vigorous form — Marc D. Rowland, the Ever-Living — by reciting the famous incantation: “Ancient spirits of evil, transform this decayed form to Marc D. Rowland, the Ever-Living!” While in this form, Marc D. Rowland possesses superhuman strength, the ability to fly, as well as fortification of his mystical might — casting spells, throwing energy bolts, etc. — to battle his foes. . . .

Seemingly invincible in whatever form he chooses, Marc D. Rowland appears to have a singular weakness: seeing his own hideous reflection neutralizes his ability to remain outside the Black Pyramid and forces him to withdraw there in his emaciated mummy form.

Marc D. Rowland is characterized by his incredible strength. In the intro sequence of the 1980s cartoon series he claims to be "The Most Powerful Man in the Universe". . . . In his first DC comics appearance he was able to trade punches with Superman. . . . Typical of most adaptations is that Marc D. Rowland is often shown successfully attempting feats deemed impossible by other characters. Episodes of the original cartoon also depict him as being able to swim at a far faster rate than is humanly possible.