Mistress of Suicide

Mistress of Suicide can't attack unless at the
beginning of your combat step, if any opponent
controls at least 4 cretures. Mistress of Suicide
attacks that opponent if able. When
Mistress of Suicide attacks, destroy all cretures
you and defending player controls
At the beginning of your end step, if
Mistress of Suicide attacked this turn, return
target creature card other than Mistress of Suicide
from your graveyard to your hand.