Robin, Fell Reincarnation

Tap an untapped creature you control: choose
one that hasn’t been chosen this turn.
•Tap another target permanent.
•Untap another target permanent.
•Draw a card.
{bull}Each opponent lose 2 life and you gain 2 life.
{t}, Sacrifice 4 other creatures: transform
Robin, Fell Reincarnation, then untap it.