The Question and Answer section for The Monkey’s Paw is a great resource to ask questions, find answers, and discuss the novel.
The Sargeant-Major says the paw has a bit of magic about it.... a spell cast on the paw by an old Fakir.
"And what is there special about it?" inquired Mr. White as he took it from his son, and having examined it, placed it upon the table.
The fact the first owner of the monkey's paw wished himself dead.
From the text:
"The first man had his three wishes. Yes," was the reply, "I don't know what the first two were, but the third was for death. That's how I got the paw."