Trinisphere taxes their low-curve spells and alternate-cost countermagic, forcing cheap cantrips, discard, and free spells to cost at least three mana. Faerie Macabre can be discarded to exile Murktide Regent's delve fuel from their graveyard pre-emptively, shrinking or denying the Dragon before it is cast, and also strips Nethergoyf's graveyard-based power/toughness. Chalice of the Void set to 1 is excellent here, stopping Thoughtseize, Brainstorm, and Ponder; keep it in. Trim the fast-mana artifacts since they do little once the opponent's disruption suite is online and Wasteland/Cavern of Souls already smooth the manabase against their countermagic.