Lifekeeper Valkyrie

Flying, vigilance
Whenever a creature dies, put a +1/+1 counter
on Lifekeeper Valkyrie.
{1}{w}{b}, {t}: Return target creature from your graveyard to the battlefield. Exile Lifekeeper Valkyrie, and return it to the battlefield at the beginning of your next upkeep.
"The souls in Valhalla will not rest this day."