Jonm, Bulwark of the Marsh

Vigilance, deathtouch, hexproof
When Jonm, Bulwark of the Marsh enters the battlefield, put a +1/+1 counter on each creature you control.
Creatures you control with +1/+1 counters on them have: "When this creature is dealt damage, remove a +1/+1 counter and prevent that damage. Each player loses 1 life."