Riku, Dark Hero

When Riku, Dark Hero enters the battlefield, exile two target creatures.
{t}: Search your deck for a Land and play it.
{t},{b}{w}: Search your Deck for Riku,
Dark Seeker.
{b}{b}: Deal 3 damage to target Creature or Planeswalker.
"If the world is made of Light and Darkness,
I'll be the Darkness."