Xanathar, Guild Kingpin Secrets of Strixhaven For each creature you control

For each creature you control with no abilities

those creatures attack each combat if able and attack a player other than you if able

that player adds one mana of any type that land produced

instead look at the top three cards of your library

Starscourge — At the beginning of combat on your turn

Xanathar, Guild Kingpin Secrets of Strixhaven For each creature you controlAt the beginning of your upkeep, choose target opponent. Until end of turn, that player can't cast spells, you may look at the top card of their library 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.