Rakdos Madness Burn combines direct damage (Lightning Bolt, Fiery Temper) with life drain (Alms of the Vein, Vampire's Kiss), so Martyr of Sands' life gain is crucial to survive the incidental drain that Prismatic Strands can't stop. Holy Light kills their small creatures like Voldaren Epicure and Sneaky Snacker while shrinking Kitchen Imp to unfavorable stats, disrupting blocks and their evasive clock. Prismatic Strands only stops damage, leaving us exposed to their black life-loss effects, so we favor the more broadly useful life gain plan instead. Guardians' Pledge is cut since this matchup often comes down to life totals rather than a pure alpha-strike race.