Retribution seeker

When Retribution seeker comes into play from your hand, target opponent chooses between losing 3 life or destroying Retribution seeker.
Whenever Retribution seeker enters the battlefield from the graveyard, target player discards a card from his hand and loses 2 life, or you gain 2 life.
{1}{w/b}: Return Retribution seeker from your graveyard to the battlefield under your control.