Sayaka Maizono

Ultimate Assistant - {t}: You may choose another target creature you control. That creature gets +1/+1 until end of turn.

Betrayal — You may sacrifice the creature you targeted with Ultimate Assistant this turn:
Draw two cards. Activate only as a sorcery.

Whenever Sayaka Maizono attacks, you may tap target creature an opponent controls. It doesn’t untap during its controller’s next untap step.