Goblin Goliath is a mythic Creature — Goblin Mutant card from Foundations Jumpstart (J25), collector number 557. Current market price: $0.38, TCGplayer market prices via Scryfall.
When this creature enters, create a number of 1/1 red Goblin creature tokens equal to the number of opponents you have. {3}{R}, {T}: If a source you control would deal damage to an opponent this turn, it deals double that damage to that player instead.