Because it involves grotesques, naturally. Here are some of the cards used to play the game:
My favourite is the Shrieking Grotesque.
"Orzhov mage-sculptors bring their stone to life before they carve it. The shrieking begins as soon as the mouths are formed."
Kinda makes me want to play. As if I didn't spend enough time sitting down. Magic: The Gathering has a pretty intriguing website, which you can visit here.