March of Swirling Mist [Kamigawa: Neon Dynasty Prerelease Promos]Set: Kamigawa: Neon Dynasty Prerelease Promos Type: Instant Rarity: Rare Cost: {X}{U} As an additional cost to cast this spell, you may exile any number of blue cards from your hand. This spell costs {2} less to cast for each card exiled this way. Up to X target creatures phase out. (While they're phased out, they're treated as though they don't exist. Each one phases in before its controller untaps during their next untap step.)