Dezi: 4000
Eula: 4000

Speed World – Molten Destruction
[Field Spell]
The Field is treated as “Molten Destruction.” All FIRE monsters gain 500 ATK and lose 400 DEF. If a player activates a non-"Speed Spell" Spell Card, they take 2000 damage. Except during the first turn of the Duel, during each player's Standby Phase: Each player places 1 Speed Counter of their own on this card (max. 12 each). This card gains effects based on the surroundings. You may remove  the proper amount of Speed Counters from this card to activate the following effects.

-4: Send 1 card from your deck to your graveyard.

-7: Inflict 800 points of damage to your opponent's life points.

-10: To Be Determined

Eula:

Level Diversity

Dezi:

Fire Insurance
[Trap Card]
When a FIRE monster you control is attacked: Discard 1 FIRE monster from your hand; Destroy the attacking monster and increase your Life Points by the difference in ATK between the two monsters.

Dezi draws. (H=6) Summons Poki Draco. (ATK: 200 → 700) Adds another Poki to his hand. Sets Fire Insurance and ends.

Eula draws. (H=6. SC → 1/1) Summons White Magical Hat. (ATK: 1000) Attacks Poki Draco.
Dezi activates Fire Insurance, discarding the second Poki. Hat is destroyed. (Dezi: 4300)
Eula sets Intercept and ends.

Dezi draws. (H=5. SC → 2/2) Tributes Poki for Firewing Pegasus. (ATK: 2250 → 2750)
Eula flips Intercept, taking Firewing.
Dezi sets Mirror Force and ends.

Eula draws. (H=5. SC → 3/3) Attacks Dezi with Firewing.
Dezi activates Mirror Force, destroying Firewing.
Eula summons The Great Phantom Thief. (DEF: 700) and ends.

Dezi draws. (H=4. SC → 4/4) Activates Speed Spell – Angel Baton, drawing two cards and discarding a third Poki Draco. Banishes two Poki Draco to summon Inferno (ATK: 1100 → 1600) and Spirit of the Flames (ATK: 1700 → 2200) from his hand. Inferno attacks.
Eula discards Getaway Card.
Spirit of the Flames attacks. (ATK: 2200 → 2500) and destroys Phantom Thief. Sets  Barrel Behind the Door and Endurance Aura. Ends.

Eula draws. (H=4 SC → 5/5) Eula activates Speed Spell – Blue Streak. (SC → 5/0) and takes Spirit of the Flames. Summons Nightingale (ATK: 700) and special summons Caligo Claw Crow (ATK: 900) Synchro Summons Dark Opera. (ATK: 2300). Attacks Inferno.
Dezi activated Endurance Aura. (ATK: 1600 → 600)
Eula sets Hook Shooter and Call of the Haunted. End.

Dezi: 2600

Dezi draws. (H=1 SC → 6/1) Activates Shift Down, drawing two cards. (SC → 0/1Activates Bonfire, adding Inferno to his hand. Speed World activates. Dezi chains Barrel Behind the Door, sending the damage to Eula. (LP: 2000) Dezi summons Infernal Flame Emperor (ATK: 2700 → 3200), banishing two Inferno to destroy Eula's set cards. Infernal Flame Emperor attacks Opera. (Eula: 1100)
Opera's effect activates, adding Infernal Flame to Eula's hand.

Eula draws. (H=2 SC → 1/2) Summons The Great Phantom Thief. (ATK: 1000) Attacks directly. (Dezi: 1600) End.

Dezi draws. (H=1 SC → 2/3) Sets Firewall and ends.

Eula draws. (H=2 SC → 3/4) Attacks with Phantom Thief again.
Dezi activates Firewall, banishing Spirit of the Flames to negate the attack.
Eula sets Menacing Phantom and ends.

Dezi draws. (H=1 SC → 4/5) Firewall's cost. (Dezi: 1100) Summons Fox Fire in Defense Mode. End.

Eula draws. (H=2 SC → 5/6)
Eula summons Night's End Sorcerer. (ATK: 1200) Attacks Fox Fire with Phantom. Attacks directly with Sorcerer.
Dezi banishes Fox Fire to negate the attack.
Eula Synchro Summons Synchro Siren (DEF: 1600). Ends.

Dezi draws. (H=1 SC → 6/7) Dezi destroys Firewall, knowing that Eula can end him with Speed World's burn if he doesn't. Summons Beast of Fire by returning all of his banished FIRE monsters back to his deck. Removes 4 Speed Counters to send a monster to the graveyard from his deck (Beast of Fire). Returns all banished FIRE monsters to the bottom of his deck to summon Beast of Fire. (ATK: 3500 → 4000) Beast of Fire's effect activates, destroying Synchro Siren and inflicting damage to Eula. (Eula: 1100 → 500) Beast attacks Eula. Eula activates Menacing Phantom, special summoning The Great Phantom Thief (DEF: 700).
Dezi ends.

Eula draws. (H=2 SC → 7/8) Eula removes 7 Speed Counters (SC → 7/1) to damage Dezi. (Dezi: 300) Sets Tuner's Trap. End.

Dezi draws. (H=1 SC → 8/2) Dezi activates Speed World's -7 Effect. (SC → 1/2)
Eula activates Tuner's Trap, banishing Night's End Sorcerer. Tuner's Trap copies the effect of Barrel Behind the Door.
Dezi: 0