He kept this a secret from Yugi, who entered with the motive to face Kaiba in a fair Duel

What was opened 500 booster packs total (multiple cases) Standard English Surging Sparks booster packs No product type filtering mixed across booster boxes and ETBs Hits pulled 85 EX cards (~1 in 6 packs) 25 Ace Specs (~1 in 20 packs) 8 different Ace Specs across the set 39 Illustration Rares (IRs) (~1 in 13 packs) out of 23 total IRs in set 22 Full Art Pokmon (~1 in 23 packs) out of 14 unique Full Art Pokmon 12 Full Art Trainers (~1 in 42 packs) out of 7 Full Art Trainers in set 5 Gold cards (~1 in 100 packs) including 2 Pikachu EX gold 7 SIRs (~1 in 71 packs) Clement's Quick Wit, Alolan Executor, Lisa's Appeal, Jasmine's Gaze, Ludos EX, Alolan Executor (2), Pikachu EX Hit rate breakdown EX cards: ~17% (1 in ~6 packs) Ace Spec: ~5% (1 in ~20 packs) Illustration Rare (IR): ~7.8% (1 in ~13 packs) Full Art Pokmon: ~4.4% (1 in ~23 packs) Full Art Trainer: ~2.4% (1 in ~42 packs) Gold card: ~1% (1 in ~100 packs) SIR: ~1.4% (1 in ~71 packs) Key takeaway: Surging Sparks is a hit-dense set by Scarlet & Violet standards

There doesn't seem to be any real need for these ETB lands - there's quite a few either double white or double black spells, but they all cost 4+ mana, so the odds of you ending up with 3 of a single tapping land are not that high
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Owner means the same thing as a standard Duel
It is fascinating to see what Yu-Gi-Oh