However, Affinity, as an ironically five-color deck, has access to some of the best and highest-impact sideboard cards in Modern (aside from Stony Silence, unless you really want to beat the mirror)
Whether Duress should see play depends on the specific strategy and meta of the deck, but it can certainly be a strong choice in the right context
While Snow Mercy only gives those creatures counters, you can use Snow Mercy to tab down those creatures, and the fun part here comes with how you activated that ability because you have to tap, then untap, then tap, then untap, then tap Snow Mercy
Depending on the Secret Lair in question, this has to be a split recommendation
Contents:100-card ready-to-play March of the Machine Commander Deck2-card Collector Booster Sample PackPlus: 10 specialty cards and 1 Foil-Etched Display CommanderDeck includes 2 Traditional Foils + 98 nonfoil cardsDeck introduces 10 MTG cards not found in the main setAccessories10 double-sided tokens, Life Tracker, special die, and deck box