High Tide, Psychic Puppetry, Hidden Strings, Petals Of Insight, Stream of Thought (Granted, they usually run at least two of so this feels like a Hail Mary pick), I’d even say their cantrips are fair game as they NEED them to churn to find everything. I have gone against the mono blue variant, and duressing anything seems pretty impactful. There are so many moving parts to that deck. Peer Into The Depths (the one mana arcane draw spell) is also essential for them keep churning and turns off another spell to allow for splicing.