Wonder if Pirate decks will become a thing or if it'll just be another gimick card which doesn't change much.
I highly doubt that. It seems like Blizzard had an idea that Pirates would be the archetype for Rogues (due to One-eyed Cheat), but the archetype has a few major flaws inherently. Pirate decks could be a deck if there are more pirates than Kragg, but we shall see. I sincerely doubt it.
Pretty shitty with the current set of cards. Pirates die too easily with high attack + low health stat distributions, and they aren't very spammable because they don't have deathrattles or multiplying effects. We need something like a Pirate version of Unleash the Hounds or Muster for Battle to make this viable. Hell even something like Imp Master or Murloc Tidehunter could suffice. I'm willing to bet Blizzard did indeed make one of those cards and hasn't released it yet?
Won't see play. 4 damage charge making as much damage as 3-cost minion, but need 4 pirates to cost as much. If you have 4 pirates, you've probably already won.
Here's the thing though. Pirates are all about tempo. They don't have to be just used in aggro style. If perhaps Blizz adds some tougher pirates or stickier ones (maybe with Deathrattles?), you could get a good midrange deck going. This would be an excellent addition to it. If they just keep pirates squishy then yes this would be pretty useless.
Blizzard values charge as a doubling of the ATK value, so inherently a 4/6 charge is valued like an 8/6 creature -- or at 6.5 mana. So the cost reduction is practically already 'icing on the cake.' :)
Rollback Post to RevisionRollBack
I looked at this card originally and I thought, you know, it's a card, and you play this card. The card will be that card that you play so you're playing a card. So, it is one thing to play a card. If you're opponent doesn't really have any cards, the card will screw up the card pretty hard, and that means it's a pretty good card.