Gríma, Saruman's Footman - [Foil, Extended Art] Tales of Middle-earth Commander (LTC) BNG This explains why the goblins

This explains why the goblins remain unaffected

you may create a 1/1 green Elf Warrior creature token

"Honorable tactics are for honorable foes

Its brilliant plumage painted streaks of color across a sky long darkened by war

Gríma, Saruman's Footman - [Foil, Extended Art] Tales of Middle-earth Commander (LTC) BNG This explains why the goblinsGrma, Saruman's Footman can't be blocked. Whenever Grma deals combat damage to a player, that player exiles cards from the top of their library until they exile an instant or sorcery card. You may cast that card without paying its mana cost. Then that player puts the exiled cards that weren't cast this way on the bottom of their library in a random order.