You imply that cutting Piledrivers for Chieftains or Krenkos turns goblins into an 'all-out aggro deck' but Piledriver does literally nothing except attack.
Chieftain and Krenko both have some additional utility outside of attacking in terms of giving haste and protecting your guys from sweepers (Golgari Charm, Engineered Plague and the like), and flooding the board with blockers (plus additional marginal applications like getting tokens for your Siege Gang or whatever).
Krenko is certainly less exciting without a haste lord but so is Piledriver.
Both Chieftain and Krenko are better than Piledriver if you're casting them into an empty board, which can happen a reasonable amount against the fair decks with removal. Not every game goes to plan with endless Ringleader chains - Piledriver is just not a very resilient card.
(Note that I'm not saying Chieftain and Krenko are the only alternatives, you could add another MWM or a 24th land or a Sparksmith or the 4th Gempalm or anything).
Nobody is comparing Piledriver to Stoneforge Mystic. I was comparing a dud Piledriver to a vanilla 1/2 for 2 mana.Quote:
Don't think of piledriver as Stoneforge Mystic. Think of it as a purely tactical card that says: if you can get your opponent to drop his guard, play this and win. No one playtests the matchup; punish them accordingly.
What does the second sentence even mean? 'Goblins has completely fallen off the radar and the current crop of players have no knowledge of cards that aren't modern-legal so Piledriver lets you kill your opponent by vialing it in endstep when they tap out.' Seems like a pretty wonky justification for playing a card.
My understanding of your argument is that you're usually going to have a field with a few goblins, and all three of these goblins exist only to put more power onto your board, so play Piledriver because it's the cheapest and has the maximum damage potential. But I still can't see how you think it's the best option when it's the most synergy-dependent of the three cards mentioned and your stated goal is to be paired against decks that have removal and blockers. I definitely wouldn't cut all of them but I think you need at least 1 Krenko somewhere in the 75 and this is what I would cut to fit it.

