Missing sideboard cards? The full 15-card sideboard runs about $94.81.
Buy sideboard on ManapoolHoly Light is a one-sided sweeper here since all our creatures are white: it drops Voldaren Epicure and Sneaky Snacker to -1/-1 and dead, and knocks Guttersnipe/Kessig Flamebreather down to survivable sizes while leaving our team untouched. Standard Bearer forces Lightning Bolt, Fiery Temper, and Lava Dart to be redirected into a 1/1 instead of our face or key creatures, buying crucial life. We trim the situational pump spells since this matchup is about surviving the burn plan and grinding with lifegain (Lunarch Veteran, Thraben Inspector clues) rather than racing. Keep Prismatic Strands and Thraben Charm in at full count as they're excellent against a burn deck with no other plan.
Journey to Nowhere is unconditional exile removal for their best threats like Thorn of the Black Rose and Baleful Strix. Their creature removal (Snuff Out, Cast Down, Agony Warp, Arms of Hadar) can't answer it, since it's an enchantment, not a creature. Destroy Evil stays in the sideboard: its creature mode only hits creatures with toughness 4 or greater, and none of their creatures qualify, and they have no enchantments for its other mode to hit. Cut Guardians' Pledge since this is a grindy matchup where card advantage and removal matter more than a one-time alpha strike.
Holy Light is strong since nearly their entire mainboard is green/black (nonwhite) creatures while ours are all white: it can wipe or weaken small blockers like Elves of Deep Shadow, Quirion Ranger, Tinder Wall and Saruli Caretaker, disrupting their mana engine and ramp. We don't have dedicated graveyard hate in our sideboard to attack Balustrade Spy or Dread Return, so the plan is to race with our aggressive curve and use removal (Thraben Charm) on their key engine pieces like Overgrown Battlement or Generous Ent. Guardians' Pledge is cut since this matchup rewards disrupting their ramp over a single pump spell; keep Prismatic Strands for protecting our clock against their few combat tricks.