1 "Dragunity" Tuner + 1+ non-Tuner monsters You can banish 1 "Dragunity" monster from your GY, then target 1 monster your opponent controls; banish it. If this Synchro Summoned card in its owner's control is destroyed by an opponent's card: You can Special Summon 1 "Dragunity" Synchro Monster with 3000 or less ATK from your Extra Deck. (This is treated as a Synchro Summon.) You can only use this effect of “Dragunity Knight - Ascalon” once per turn.
Dragunity decks like to interact with their graveyard, and they do not interact much with the banish zone. Burial from a Different Dimension allows you to return those banished cards back to the graveyard so they can be reused.
After Dragunity Knight - Ascalon is destroyed he is able to Special Summon any Dragunity Synchro monster for free.
You will need to load your graveyard with the Dragunity monster to use Dragunity Knight - Ascalon’s powerful removal effect. Dragunity Knight - Gae Dearg is great for this while also searching your deck. Dragunity Divine Lance equipped to a Dragunity monster which uses its equip cards as cost, like Dragunity Knight - Vajrayana, which will also load your graveyard.
Use Future Fusion to make Five-Headed Dragon pitch multiple Dragon-type Dragunity monsters to your graveyard.