Boggart Mob is a rare Creature — Goblin Warrior card from Lorwyn (LRW), collector number 104. Current market price: $4.10 (foil $16.00), TCGplayer market prices via Scryfall.
Champion a Goblin (When this enters, sacrifice it unless you exile another Goblin you control. When this leaves the battlefield, that card returns to the battlefield.) Whenever a Goblin you control deals combat damage to a player, you may create a 1/1 black Goblin Rogue creature token.