Ravager of minds

Devoid (This creature has no color)

Whenever Ravager of minds is tapped for the first time each turn, you may have target opponent reveal their hand, during this you may cast a nonland nonlegendary spell from their hand using mana as if it was any color to cast it, then if that spell has generic or collerless mana in its casting cost, untap Ravager of minds
{t}: lose 1 life and add {c}