diff --git a/Sources/Monarch/MigrationBuilder.swift b/Sources/Monarch/MigrationBuilder.swift
index 60c7722..33af986 100644
--- a/Sources/Monarch/MigrationBuilder.swift
+++ b/Sources/Monarch/MigrationBuilder.swift
@@ -3,4 +3,37 @@ public struct MigrationBuilder {
     public static func buildBlock(_ migrations: Migration...) -> [Migration] {
         return migrations
     }
+
+	public static func buildBlock(_ migrations: [Migration]...) -> [Migration] {
+		migrations.flatMap { $0 }
+	}
+
+	public static func buildExpression(_ expression: Migration) -> [Migration] {
+		[expression]
+	}
+
+	public static func buildExpression(_ expression: [Migration]) -> [Migration] {
+		expression
+	}
+
+	public static func buildOptional(_ migration: [Migration]?) -> [Migration] {
+		migration ?? []
+	}
+
+	public static func buildEither(first migration: [Migration]) -> [Migration] {
+		migration
+	}
+
+	public static func buildEither(second migration: [Migration]) -> [Migration] {
+		migration
+	}
+
+	public static func buildArray(_ migrations: [[Migration]]) -> [Migration] {
+		migrations.flatMap { $0 }
+	}
+
+	public static func buildLimitedAvailability(_ migration: [Migration]) -> [Migration] {
+		migration
+	}
+
 }