"Magical Stone Excavation returns Wonder Wand," Kira said.
"And the two cards I discarded as the cost for Excavation—both trigger as well."
He revealed them.
"Both are ’Night Assailant.’ When sent to the GY, add 1 Flip monster from your GY to your hand, except ’Night Assailant.’"
He paused, smiling.
"And Night Assailant is itself a Flip monster."
Adrian frowned. "But you said Night Assailant can only add ’one other than itself’..."
"Right—’other than itself’ only means you can’t target that exact copy. Targeting a different Night Assailant in the GY is fine." (Old version effect)
Kira added both Assailants back to hand after showing them.
"Assailant A retrieves Assailant B, and B retrieves A—both return to hand."
"Also, last turn you activated ’Lucky Cloud’ and ’One Day of Peace,’ and I just activated a Spell. So Library now has three counters.
I use Library’s second effect: remove three counters to draw 1 card from the Deck!"
He drew one.
"Then I activate a second ’Magical Stone Excavation,’ discarding two cards to return a Spell from the GY to my hand."
He sent two more from hand to GY.
"I discard two and return the first Excavation."
Adrian: "!"
So the two he discarded were—
"Indeed—two more ’Night Assailants,’" Kira grinned. "And once again, they retrieve each other back to my hand."
Adrian’s face chilled; he understood.
Two Night Assailants are discarded together as the Excavation cost, then they fetch each other—an infinite cost engine.
And with one Excavation in hand and one in GY, the two Spells can loop each other—an infinite Spell activation loop.
At first glance, it’s just cycling resources between hand and GY—no net gain. But with Royal Magical Library, it’s different.
Each activation puts a counter on Library; every three counters draws a card.
That’s an infinite draw loop!
"You plan to deck yourself out...?" Adrian growled.
"Hahaha—of course not."
In moments, Kira had a fistful of cards—nearly half his Deck in hand.
"Alright, that should do. The cast is in position; the performance is about to begin."
Adrian frowned.
Performance?
"I equip the ’Wonder Wand’ to Royal Magical Library," Kira said. "I send Library and Wand to the GY to draw 2 cards."
"Then one last ’Magical Stone Excavation’—discard two to return the other Excavation from the GY."
Adrian noticed that this time, Kira didn’t use Night Assailants to retrieve each other.
So he didn’t discard Assailants this time?
A thought struck Adrian.
One last Excavation... was it to send a specific card from hand to the GY?
"I Normal Summon ’Asura Priest.’"
[Asura Priest, ATK 1700]
"I activate the Spell ’Necro Sacrifice’—by Special Summoning one or two monsters from my GY to your field, I reduce the number of Tributes needed for a Tribute Summon based on the number Summoned." (Anime card)
A beam of gold shot from Kira’s Duel Disk.
"I Special Summon ’Tainted Wisdom’ to your field!"

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