Abzan Greasefang wants to fill its graveyard and then cheat Esika's Chariot or Parhelion II into play via Greasefang, Okiba Boss. Spell Snare is great at countering their two-mana setup pieces like Professor of Symbology and Cache Grab, and it also hits Bitter Triumph and Collective Brutality. Greasefang itself has mana value 3, so Spell Snare can't counter it. Mystical Dispute only gets its discount against blue spells, and they have none, so it is a full-cost three-mana soft counter. Include it as an extra flexible counter for their key spells, but they can pay through it if they leave mana up. Negate can hit Esika's Chariot and Parhelion II when cast, but it does nothing against their creatures such as Greasefang, Professor of Symbology and Formidable Speaker, and it can't stop Greasefang returning a Vehicle from the graveyard, so trim it down. Keep Fiery Impulse and Volcanic Spite to kill Greasefang, Okiba Boss or Professor of Symbology and slow the Vehicle plan. Volcanic Spite kills Greasefang outright, while Fiery Impulse needs spell mastery to deal 3.