1) Declare attack with Spectral Duke Dragon + select target (obviously a vanguard if you want to activate it's effect).
2) Declare if you are boosting.
3) Guard phase.
4) Drive check Phase.(If you get a heal trigger then heal one of your damages).
5) Damage check Phase.
6) Close Step (You can Activate Spectral Duke Dragon effect here).
- If you have in your damage zone less than 4 damages, you can't use Spectral Duke Dragon effect. If you can use it's effect, do it, pay it's cost and stand it. Its effect can be activated even if he doesn't hit. After activate its effect repeat the phases, when you reach the Drive check Phase you ONLY CHECK 1 CARD, because he lost his Twin Drive ability.
- If you manage to gain another 3 units after his Limitbreak with cards like: Player of the Holy Bow, Viviane, Lop Ear Shooter etc, you can activate his Limitbreak again if possible.
7) during the turn your using Spectral Duke Dragons limit break if you get a trigger eff like a critical it lasts till the end of the turn not battle so if you attack after standing with limit break it would still have the effects of the trigger