For the rainbowversion I'd suggest two rage Potions instead of Overdrive.
Rage Potions would offer 12 more Attack, while the Titan can take the 12 damage easily and the Crusader only gets the Attack-Boost. 3 SNs would be enough to play them, so the Firequantum shouldn't be a problem.
Mainreason for this thought: Either Overdrive or Liquidshadow, there is nor "and" as both replaces the other. Of cause you could wait 4 Turns of overdrive to get the same attackboost as with Rage Potions, but these are instant and also good CC.
