Other good blue Pirates include Kitesail Corsair (which gains flying when it attacks) and Merchant Raiders (which keeps an opponent's creature tapped as long as it's on the battlefield)
Remember, this will usually just be one creature - unless you're facing a stack of identical creatures like the Hurloon Minotaurs above
I actually dont think that General Kreat offers much as a commander, but shell go great in the 99 of decks such as Krenko, Mob Boss or Purphoros, God of the Forge that are already looking to throw massive amounts of tokens onto the battlefield to finish off opponents
It triggers in anyones turn, too, making the once-per-turn clause hardly a limitation
Pestilent Haze This
Rather, board wipes will destroy, damage, or otherwise remove all creatures on the battlefield indiscriminately