March of Swirling Mist

Feb 18, 2022 · You may exile more cards than necessary for March of Swirling Mist's first ability, but you can't reduce the mana it costs to less than {U} this way.

Feb 18, 2022 · Phased out permanents are treated as though they don't exist. They can't be the target of spells or abilities, their static abilities have no effect on the game, their triggered abilities can't trigger, they can't attack or block, and so on.

Feb 18, 2022 · As a creature is phased out, Auras and Equipment attached to it also phase out at the same time. Those Auras and Equipment will phase in at the same time that creature does, and they'll phase in still attached to that creature.

Feb 18, 2022 · An attacking or blocking creature that phases out is removed from combat.

Feb 18, 2022 · The mana value of March of Swirling Mist while it's on the stack is the value chosen for X plus 1, no matter how much mana you actually paid to cast it.

Feb 18, 2022 · If an opponent gains control of one of your creatures, that creature phases out, and the duration of the control-change effect expires before it phases back in, that creature phases in under your control as that opponent's next untap step begins. If they leave the game before their next untap step, it phases in as the next untap step begins after their turn would have begun.

Feb 18, 2022 · Any continuous effects with a “for as long as” duration, such as that of Mind Flayer, ignore phased-out objects. If ignoring those objects causes the effect's conditions to no longer be met, the duration will expire.