Rithken, Vengeant King

{u}: Rithken gains first strike until end of turn.
{1}{b}: Target creature blocks Rithken this turn
if able.
{2}{r}: Rithken gets +2/+0 until end of turn.
Damage dealt this turn by Rithken can't be
prevented. Activate only once each turn.
{3}{g}: Rithken gains lifelink and indestructible
until end of turn.
{4}{w}: Attach an Aura card with enchant creature
from your graveyard to target creature.