Nightwatcher

Skulk
When Nightwatcher enters the battlefield, put a
boon counter on up to three target creatures. While creatures have a boon counter on them, they have indestructible.
When Nightwatcher deals combat damage to a
player, proliferate.
{1}{u}{b}{g}: Creatures with boon counters get
-x/-x until end of turn, where x is the number of
boon counters on the creature.