Koku, the Sable Mask

At the beginning of your upkeep, draw a card.
Pay 2 life, Discard a card: Put a +1/+1 counter
on Koku. She gains hexproof until end of turn.
Remove X +1/+1 counters from Koku: Prevent
the next X damage that would be dealt to her
this turn. If damage is prevented this way, she
deals that much damage to any target.