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

This doesn't seem like a downside at all as there are numerous ways to tutor up a pile to where you can pretty much get both cards

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

Owner means the same thing as a standard Duel

The other is Beckon, which states that during your turn, whenever another character of yours enters play exerted, you may draw a card