March of Swirling Mist

Marcha de la niebla envolvente (March of Swirling Mist) (es)

Instant (CMC 1)
As an additional cost to cast this spell, you may exile any number of blue cards from your hand. This spell costs 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.)