Demon of the Harvest

Deathtouch, lifelink, flying
when another creature with deathtouch or lifelink enters the battlefield you may choose one:
-Demon of the Harvest becomes invincible until end of turn
-All creatures you control get +1/+0 until end of turn
when a creature is destroyed by Demon of the Harvest put a +1/+1 counter on it
when a creature you control gets a +1/+1 counter you may gain 1 life