What are the abilities of Visions of Phyrexia?
user
At the beginning of your upkeep, exile the top card of your library. You may play that card this turn.\nAt the beginning of your end step, if you didn't play a card from exile this turn, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")
assistant