Niambi, Beloved Protector

Flash
When Niambi, Beloved Protector enters the
battlefield, if you cast it, chose target
nonlegendary creature card in your graveyard
that was put there from the battlefield this turn.
Return it to the battlefield and put a Boon
counter on it that reads
"Whenever this creature becomes the target of a
spell or ability, draw a card. This ability triggers
only once each turn."