Pinili, the Chosen

Flying, Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you
control both of them)
At the beginning of your upkeep, if Pinili is
paired with another creature, you may put a
+1/+1 counter on each of them.
When either Pinili or the creature paired with her
dies, you lose the game.