The element mercury is best known as the metal that’s also a liquid at room temperature. But you may not know that mercury doesn’t evaporate until its temperature hits 674.11 °F. I certainly didn’t! I had to look it up. That’s 462.11 degrees hotter than the boiling point of water. If you’ve ever scalded yourself with hot water or steam, you know how painful that can be. Imagine then getting hit with a jet of evaporated mercury. Add in the possibility of mercury poisoning through skin contact or vapor inhalation, and you’re in for a bad time. That Phyrexian in the card art will get off lucky if the worst that happens to it is getting returned to its owner’s hand.
10,000 Reasons Why the MTG Multiverse is a Terrible Place to Live 