"Volcanic Eruption" is not a "Volcanic" card because it does not have 「ヴォルカニック」 in its Japanese name. In the Italian version, the inclusion of "Volcanic Queen" seems to be implicit, because her name doesn't contain "Vulcanico".
When you successfully Summon "Volcanic Doomfire" you can activate "Final Attack Orders" to make all your opponent's monsters switch to Attack Position and then they will be forced to attack "Doomfire" via its effect. You can add to the burn damage by Summoning "Lava Golem" to your opponent's side of the field. This is also a good way to take out cards that could be harmful to the Deck's strategy, such as "Stardust", "Prime Material" and "Aurkus, Lightsworn Druid".
If you can have "Doomfire" on the field you can activate "Ojama Trio" and "Battle Mania" in that order on your opponent's turn. The "Ojama Tokens" will be forced to attack "Doomfire" due to its effect and because they are Tokens, and are not sent to the Graveyard when destroyed by battle, the effect of "Doomfire" will not activate, thus resulting in 9000 battle damage and 900 effect damage.
It is easy to add "Uria, Lord of Searing Flames" to this type of Deck. You possibly have most of the needed Continuous Trap Cards such as: "Gravity Bind", "Backfire" and "Coffin Seller". You can use "Gravity Bind" to stall and burn using the Decks main strategy until you get the necessary 3 Traps, then send "Gravity Bind" to the Graveyard when Summoning "Uria", and you are free to attack with at least 3000 ATK. Also if you are on the ropes, and dont have the necessary Trap Cards, "Uria" is a 0 ATK Pyro monster, so it qualifies for use with "Blaze Accelerator".