Cameron, Merciful Master

Whenever you cast a creature spell, you may sacrifice another permanent. If you do, draw a card and target opponent mills three cards. {2}{U/B}{U/R}, {T}: Until your next turn — • Whenever an opponent attacks you with one or more creatures, those creatures don’t untap during their controller’s next untap step. That player draws a card. • Whenever you or an opponent casts an instant or sorcery spell from their hand that targets exactly one creature you control, exile that spell as it resolves. It becomes plotted.