March of Swirling Mist

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.)

Profaner of the Dead

Exploit (When this creature enters, you may sacrifice a creature.)
When Profaner of the Dead exploits a creature, return to their owners' hands all creatures your opponents control with toughness less than the exploited creature's toughness.

Gyre Engineer

River's Rebuke

Return all nonland permanents target player controls to their owner's hand.

Evacuation

Return all creatures to their owners' hands.

Aether Gale

Return six target nonland permanents to their owners' hands.

Inundate

Return all nonblue creatures to their owners' hands.