Keep in mind that at the beginning of Duel Links, these were amongst the best beatsticks at the time. (Power of Dark beatdown was basically the meta at that point.) That being said, it probably wasn't power reasons. They just threw one in there as a level-up reward without much thought. There's much worse cards with 1 copy, too, like Pendulum Machine and Gust.
...Why would Kaiba's level-up rewards have anything to do with a decade-old TCG-only Starter Deck? The reason it's a level-up reward here, and why it was in SKE, is because it's a Kaiba card. Incidentally, the fact you get 2 Lord of D. as level-up rewards would prove your point irrelevant anyway, since SKE only has 1.
I'm glad they're willing to do this now. (Chain Destruction's the first time it's happened outside a pick-a-gift campaign.) Though I wish some of the more basic stuff would just be added to their drops. (No reason why cards like Thousand Dragon, Eradicating Aerosol and Sonic Jammer shouldn't be grindable.)
Anoymous
Badger
