Clarisse, Fatal Error

Clarisse, Fatal Error, can't be blocked.
Whenever Clarisse deals combat damage to a
player, gain control of target artifact or creature
that player controls. If that player doesn't control
an artifact or creature, they reveal their hand.
You may cast spells from their hand this turn,
and you may use mana as though it were mana of
any type to do so.
"Computer viruses are oddly inspiring..."