Shamanic Successor

When Shaman Successor enters the battlefield, create a 1/1 colorless Spirit creature token for each creature card in your graveyard.
Tap an untapped creature you control: Add {b}, {r}, or {g} to your mana pool.
{2}{r}, Sacrifice a creature: Shaman Successor deals 2 damage to target creature or player.
I am the embodiment of nature's cruelty.