Haku, Zabuza's Tool

Flash
Crystal Ice Mirrors — You may have Haku enter
the battlefield tapped. If you do, tap two other
target creatures. As long as Haku remains
tapped, those creatures can't untap, lose all
abilities, and gain shroud. You may choose not
to untap Haku during your untap step.
"When someone protects something precious to them,
they become truly strong."