Amulet Titan ramps with Amulet of Vigor, Arboreal Grazer, and bounce-lands to reach Primeval Titan or Scapeshift. Pithing Needle can't touch most of that plan: Amulet of Vigor only has a triggered ability, and land mana abilities are exempt. It is still a reasonable single-card swap because it can be named on Boseiju, Who Endures to shut off its channel ability, which would otherwise destroy your artifacts or nonbasic lands. It can also be named on Urza's Saga to stop their Construct-making ability. This matchup is primarily a speed race since Amulet Titan has minimal interaction with your board, so keep your equipment suite and Esper Sentinel taxing their noncreature spells like Amulet of Vigor, Spelunking, and Scapeshift. Watch for Boseiju, Who Endures, which appears in both their main deck and sideboard and can destroy your artifacts or nonbasic lands. Overall just a single targeted swap is needed since the matchup favors whichever deck executes its plan first.