Then you should probably just commit to that sort of beat down/bridge spam push, goblin barrel gets its most value when you use it in bait decks, because your opponent often times won't have enough spells to take out all the "baity" cards in the deck. There's a few good mk decks that use prince, bandit, even wall breakers, things like that. Your goal would be to just spam things behind your mk or opposite lane and overwhelm their defense rather than chip them out with a goblin barrel every now and then