March of Swirling Mist

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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. <br>Up to X target creatures phase out. <em>(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.)</em>