Envy, the Jealous

At the beginning of your upkeep, choose target opponent. Until the end of your turn, that player can’t cast spells, you may look at the top card of their library at any time, you may play the top card of their library, and you may spend mana as though it were mana of any color to cast spells this way.

”They won’t. I want to see their faces as I take the Philosopher’s Stone away from them. I want to witness them lose everything!”