Thankfully, the card only lasted a few months before it was banned, with Wizards promising to use the lessons learned by Nadu to hopefully avoid making the same mistake in the future
after a surge, prices often cool down
Phyrexian mana can be identified by it replacing the usual mana symbols with the Phyrexian emblem (a circle with a line cutting vertically through it)
It's certainly a powerful spell if you have other ways of dealing your opponents mill, or as I like to call it, "deck damage." You can pair this with cards like Deadly Cover-Up and Space-Time Anomaly, assuming you can survive to those turns in the game
The black staple sees play wherever its legal, and this is a premium version of an otherwise $5-9 card
Your cards will be safe from harmful chemicals that can damage them in the long run, so collectors and competitive players can have peace of mind