A Heart Betrayal

Gain control of target legendary creature an
opponent controls and put a betrayal counter
on it, it gains "as long you control another
legendary creature, prevent all noncombat
damage dealt to a creature with a betrayal
counter on it"
"The tragic aspect of the legends arises from the
behavior of people closest to the king. Guinevere,
Arthur's queen, and Lancelot, his beloved friend
and best knight, betray Arthur by becoming lovers."