Compared to the animation effects, it cannot affect monsters summoned in defense position, but it's usually sufficient.
However...
The thunder-wrapped Thunder Bolt flew through the air, while the Divine Phoenix merely wrapped its body with its wings, as if cloaking itself in Flame Armor.
Several Thunder Bolts struck viciously against the Phoenix's body, but the effect was little more than causing the flames to flicker temporarily, failing to cause any substantial damage.
"Hahaha did you think a Lightning Attack could pierce the Phoenix's armor?" Marik laughed, "This turn, 'Divine Phoenix' is invincible! It cannot be destroyed by battle and is immune to any magic, trap, and monster effects!"
He chuckled to himself, "And now I'm going to recite the third line from the Winged Dragon's inscription and use the Phoenix's final ability!"
Marik crossed his arms, closed his eyes, and began to chant the ancient priestly texts.
"Divine Phoenix's final ability, activate!" Marik finished the incantation, feeling elated, and laughed heartily, "Pay 1000 LP to destroy all monsters on the field! Disappear now, Slifer!!!"
As stated earlier, in the animation, before the final battle with Yugi, the third ability of the Winged Dragon was to pay 1000 LP to destroy all monsters on the field, but only during the final duel with Yugi, when he used Monster Reborn to resurrect Slifer to block the attack, did the third ability of the Winged Dragon destroy only Slifer, leaving all other monsters on Yugi's field intact.
So one could speculate that the Winged Dragon's field-clearing ability might be reduced when an Egyptian God is on the opponent's field; or that Slifer might have a taunt effect beyond its textual description, able to take the hit for its allies.
But no matter what, the result was that Slifer turned to ash under the power of Divine Phoenix.
But it doesn't matter; Youyu's LP is like a candle in the wind, and Marik still has a chance to come back in his final turn!
"Disappear, Slifer!" Marik shouted.
[Marik, LP 1100→ LP 100]
The flaming Winged Dragon simultaneously roared, as if saying——Oh, were you being particularly arrogant last turn? Are you trying to rebel?
Then a fiery storm swept across, not giving Slifer a chance to explain to its boss, burning it directly to ash.
After the burn, the Winged Dragon let out a long sigh, exhaling flames, as if conveying a message——
——Refreshing!
"Heh, Slifer the Sky Dragon is destroyed." Marik chuckled, "This way, next turn..."
"There is no next turn." Youyu said calmly.
Marik's pupils contracted, "What?"
Divine Phoenix is absolutely invincible, and would remain on the field until the end of the turn. Any damage the Phoenix inflicts on players is 0, and it's immune to any card effects... In this situation, can this guy still finish Marik off in this turn?
It was previously mentioned that after the Noah arc, Youyu obtained several magic trap cards of ambiguous significance and moderate rarity...
...And now it's time for one of those cards to shine!
Let me show you what true ambiguity means!
"Activate the set card, Trap Card activation!" Youyu waved his hand, "Grave Robber!"
"Ah!" Jonouchi was taken aback, "The same card as mine!"
"Grave Robber can use a Magic Card from the opponent's graveyard! (Anime effect)" Youyu smiled, "So Marik, since you used mine, we'll reciprocate the gesture."
Marik: "Uh..."
The projection of the short Grave Robber appeared and quickly stole a card from Marik's graveyard. The short figure ran back to Youyu with a card, flipping it over to reveal the "Monster Reborn" that Marik had failed to activate last turn.
"I'm also using 'Monster Reborn', to resurrect the God!" The card in Youyu's graveyard popped up, and he placed it back on the Duel Disc.
"Return from the Netherworld, God! Slifer the Sky Dragon!"
Heavenly thunder descended, and the red gigantic silhouette emerged, the majestic divine dragon once again descended on the field behind Youyu!
[Slifer the Sky Dragon, ATK 6000]
"Grave Robber!?" Marik sneered, "But so what? I already said, in its Divine Phoenix state, the Sun God is invincible! Even if you attack with Slifer again, it's useless!
And after this turn, Slifer will return to the graveyard..."
"Hmm, I know." Youyu said, "That's why I said there's no next turn! From my hand, I activate the Magic Card - Mystic Box!"
[Slifer the Sky Dragon, ATK 6000 → ATK 5000]
"?" Marik showed a puzzled expression.
"Mystic Box targets one monster on each field!" Youyu said, "The opponent's monster is destroyed, and the selected monster on my field changes control to the opponent!"
"Hahahaha, I already told you Divine Phoenix is invincible! Even magic effects can't affect it..."
"I know! But the Phoenix's effect is 'unaffected by card effects', not 'negates card effects'." Youyu interrupted, "So even if it can't destroy the Winged Dragon, the effect of Mystic Box still proceeds!"
Marik suddenly realized: "Could it be...!?"
"Exactly!" Youyu pointed beside him, "I'm transferring control of the 'Dark Magician' on my field to you, Marik!"
Marik: "!!??"
The Dark Magician leapt up, in a blink had jumped in front of Marik, crossing his arms with a grunt.
Simply following his master's command.
Marik's inner thought: ——Aargh, don't come closer!!!
[Dark Magician, ATK 2500]
[Slifer the Sky Dragon, ATK 5000]
[Marik, LP 100]
"This is truly the final battle!" Youyu shouted, "Slifer the Sky Dragon, attack the 'Dark Magician'! Super Conductive Wave—Thunder Cannon! Shatter Marik's Dark Personality!!"
The endless golden impact was unleashed, engulfing the body of the Dark Magician, drowning Marik like a tide.
Dark Marik contorted his facial muscles to an incredible extent as he was swallowed, screaming a prolonged "Aaaaah!"
The golden impact tore through the darkness, flying out of the Darkness Game sphere, vanishing into the horizon, and causing rolling thunder, which gradually returned to silence.
[Marik, LP 0]