March of Otherworldly Light is a rare Instant card from Kamigawa: Neon Dynasty Promos (PNEO), collector number 28p. Current market price: $0.86 (foil $1.80), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, you may exile any number of white cards from your hand. This spell costs {2} less to cast for each card exiled this way. Exile target artifact, creature, or enchantment with mana value X or less.