Lord Fool, Trial Observer

Other Zombies you control get +1/+1.
{2}{b}, {t}, Sacrifice a creature: Return a Zombie creature card at random from your graveyard to
the battlefield. Activate only during your turn
and only if there are at least three Zombie
creature cards in your graveyard.
Lord Fool, give me another chance. I'll prove my
strength to you!
—Little Fool