Battle Kraken is the unequaled combat octopus of the metagame, as ridiculous and awesome a title that is. You never know what tricks a Battle Kraken can pull from its sleeves... That is, unless you're reading this.
It is also useful for locking opponents in with Tentacle Zap; 3 rounds for 2 EN is a steal! It's also capable of dealing standard damage per turn with Kraken Smack.
Possible evolutions include: