Serra Angel [Game Night 2018] Human Cleric Knight you may put a +1/+1

you may put a +1/+1 counter on Deathbringer Thoctar

if there are two or more ki counters on Hired Muscle

Set: Ultimate Masters Type: Instant Rarity: Common Cost: {1}{U} Counter target spell unless its controller pays {2} plus an additional {2} for each card named Rune Snag in each graveyard

This explains why the goblins remain unaffected

Serra Angel [Game Night 2018] Human Cleric Knight you may put a +1/+1Set: Game Night 2018 Type: Creature Angel Rarity: Uncommon Cost: {3}{W}{W} Flying, vigilance The angel remembers her past lives like dreams. Her song held up meadows. Her blade drove back darkness. Her wings carried her across the ages.