Gro-A-Tog relies on Psychatog which grows by exiling cards from its own graveyard, so the extra Tormod's Crypt can strip fuel for its pump ability at a critical moment and also protects you from their own Deep Analysis style plans. Chain of Vapor gives you a way to bounce a threatening Psychatog temporarily to dodge lethal combat math. Arcane Denial is weak since this deck is already drawing extra cards through Gush, Accumulated Knowledge, and Opt, so feeding it further card advantage is counterproductive. This matchup is close to a mirror in speed, so prioritize protecting your own combo over durdling.