Use Barcgal. With his effect to be called to your Rear Guard, you can utilize his other effect to call Flogal and Future Knight, Llew. With those effects, you can Superior Ride into Blaster Blade, and have your Soul ready for Soul Saver Dragon. Not to mention, other units of yours will be powered up using this method.
EDIT: This deck was made before Barkgal was banned from Starting Vanguard position in tournaments. If you want to find a Royal Paladin Deck that doesn't have Barkgal as Starting Vanguard, go to the Strategy II posts that I have made.
Basic Strategy "Soul":
With that being said, the main focus is using "put this card into Soul" costs to fuel the Soul for Soul Saver Dragon. With Soul Saver Dragon's Soul Blast, you boost your Rear Guards past normal limits, then if they have "If a card gets sent to Soul, they gain +3000 Power.", it'll become formidable. The cards that have the "If a card gets sent to Soul, they gain +3000 Power." are as follows:
Cards that you can add from your Rear Guard to your Soul for effects are as follows:
With 16 Grade 0 Shields (12 shields are 10000, 4 shields are 5000) and 11 Grade 1 Shields (5000), you can guard against plenty of attacks. With Knight of Truth, Gordon as an interceptor, you can have it as a 10k Shield, otherwise it's a 5k Shield. Other interceptors are 5k Shields, regardless if they intercept or if you use them from the Hand. If you use Flash Shield Iseult as a Guardian, you can discard a card to block an attack.
Sample Deck List:
If you have any questions, leave a comment.