Alternatively, "Buster Dragon" can be used to revive "Buster Blader", which can then be used with any "Destruction Sword" Tuner to Synchro Summon a second "Buster Dragon" then Xyz Summon any Rank 8 monster.
When using this card, sending "Destruction Sword Memories" and a Buster Blader monster from the Deck to the Graveyard to Special Summon "Buster Dragon" while already having a Dragon in the Graveyard. Then you can chain directly "Destruction Sword Memories" to summon "Buster Blader, the Dragon Destroyer Swordsman" to lock the opponent creatures out for a few turns. This is great when done when the opponent wants to attack you, because with both Monsters put all (affected) opponent creatures in defense mode.
Using "Buster Whelp of the Destruction Swordsman" to search out this card, can give you the dragon you need in the graveyard to be used for "Destruction Sword Memories".