Icebreaker Kraken needs to be banned period
Look the whole point of rebalancing in Alchemy is because you know cards are broken. So why would you rebalance cards for alchemy and allow them to continue to be used in their old state in Standard??? If you are rebalancing a card you know is broken and putting it in Alchemy you should ban it from standard as it should have been in the first place instead of making it only reasonable in Alchemy and leaving it broken in Standard. Anyone with half a brain can see this is a cheap tactic to push more players into playing Alchemy instead of standard and if you have to do that then maybe Alchemy is the FANTASTIC new game mode you profess it to be.
Icebreaker Kraken has had 0 impact of the Standard environment