Why is The Kraken so weak/powerful in practice mode?

In standard matches, the Kraken’s strength is determined by the total amount of gold in the match. The longer the game goes one and the more gold the teams have accumulated, the stronger the Kraken gets.

So in a Practice Match, if you don't use Pot of Gold, the Kraken will be weak - but if you do use Pot of Gold many times, the Kraken becomes extremely powerful. Use Pot of Gold to get the items you want to purchase and don’t go overboard in accumulating Gold if you plan to fight the Kraken.