Emerging Moss-Watcher

At the beginning of each end step, if a card left a graveyard this turn, you gain 1 life and each opponent loses 1 life.
{b}: If Emerging Moss-Watcher isn't a creature, put a +1/+1 counter on it and it becomes a 0/1 Elemental Construct creature with Deathtouch until end of turn. If it's power is 5 or more, it's a creature with Deathtouch permanently.