Result : Opponent's game loss
Notice how the cards artwork shows a Barbarian breaking a shield only to reveal a cute and seemingly defenseless Octopus inside
The goblin berserker deals direct damage whenever you cast your first spell each turn generates some value from it, even if Krark, the Thumbless returns it to your hand
You'll want to keep him as safe as possible with Bodyguards, Locations, and characters that grant him Ward or Evasive because if your opponent can't get rid of him quickly, you can run away with the game.
However, because creatures with those types are so massive, you can also design flavorful cards like Whelming Wave
You may choose new targets for the copy.) Spell redirection (Change the target of target spell and/or ability with a single target.) Stealing permanents, permanently Switching power/toughness "Time Walk" (Take an extra turn after this one.) "Transformation" (Target creature becomes a color/card type with N power and N toughness.) "Tutor" for an artifact