Roku, Precedent Avatar

When Roku, Precedent Avatar enters the battlefield, it deals 4 damage distributed as you
like to any number of targets.
Vigilance, Menace, Mentor.
{g}{u}{w}{r}: Roku, Precedent Avatar gets +4/+1
until end of turn
{1}{u}: Draw a card, then discard a card.
{3}{g}{u}{w}{r}{r}, sacrifice another Human Creature
you control: you may cast Roku, Precedent Avatar
from your graveyard. If it is cast this way,
it gains haste until end of turn.