Faithless Looting discards Fiery Temper into exile for its madness cost, so Faerie Macabre's graveyard exile does nothing to stop that engine and stays in the board. Darkness is excellent since it blanks an entire turn of combat damage from their attacking creatures, letting you stabilize through their damage-race plan. Weather the Storm gains 3 life per spell cast before it this turn (storm), directly countering their incremental ping damage from Kessig Flamebreather and Guttersnipe. We shave the 4 Architects of Will and the single Repository Skaab since neither answers their fast clock, favoring maximum lifegain and damage prevention instead.

Tolarian Terror and Cryptic Serpent both cost {1} less for each instant and sorcery card in the opponent's graveyard, so Faerie Macabre is premium here — discarding it to exile up to two graveyard cards directly taxes their key threats back up in cost, or it can be cast as a flying blocker if needed. Darkness provides an instant-speed way to prevent all combat damage, buying crucial time against their massive Tolarian Terrors and Cryptic Serpents while holding up mana. We cut Architects of Will and Repository Skaab since their card selection is too slow against a deck with Counterspell and Dispel backup, and we need to be proactive rather than grindy.

Tron assembles Urza's Tower, Urza's Mine, and Urza's Power Plant to power out huge threats like Maelstrom Colossus and Bramble Wurm, so Duress can choose noncreature, nonland cards to strip a key piece of the assembly like Ancient Stirrings or Expedition Map before they find their lands, and it can also take their Relic of Progenitus before it strips our graveyard. Faerie Macabre gives us a cheap flying blocker against their large ground creatures and can be discarded to exile target cards from graveyards. We cut Repository Skaab and Architects of Will since this matchup is a race against a slower ramp deck, and proactive disruption of their mana assembly matters far more than incremental card selection.