Haste + True Strike + 3 * Scorching Ray (Empowered) will result in a guaranteed 36d6 damage against which there is no save at level 7/8.
Haste + True Strike + 3 * [Any] Orb will result in a guaranteed 24d6 damage (at level 8), no save, which also pierces spell resistance automatically.
Haste + True Strike + 3 * [Any] Orb will result in a guaranteed 24d6 damage (at level 8), no save, which also pierces spell resistance automatically.