Kefnet, Knowledge Bastion

Flying, Indestructible, Vigilance
Kefnet, Knowledge Bastion can't Attack or Block unless You have Five or More Cards in Hand
{w}{u/b}: You Gain 2 Life and Draw a Card
{u}{w/b}: Tap Target Creature and Draw a Card
{b}{w/u}: Each Opponent Loses 2 Life, Draw a Card