That's a giant +6/+6 for four mana total, which is quite nice although not as flexible as the Scimitar and it's more to equip
The 15 Best Goblin Cards for Commander Hailing from a classic kindred set, 2002s Onslaught , Goblin Piledriver was a major power player in Standard decks from the era, which were focused on getting as many Gobbies in play as possible and then profiting from this cards second ability that boosts its power based on the number of other attacking Gobs
Logic Knot allows flexibility in countering spells by using delve to adjust the amount of mana or cards to exile
Being able to produce armies off one card like this is a huge advantage for Mono-Blue Storm and makes it one of the most important cards of the deck
And what are some common deviations to watch out for
As well as being able to swap what it's copying on your upkeep, this is also a may ability, so you don't have to