The game features distinct regulation marks on cards, helping players easily identify which ones are currently tournament-legal
Sun's Champion kills as quick as Apex Predator even if cast on the same turn but she can't beat anywhere near the number of other cards that Apex Predator can
If an attacking creature you control goes unblocked, you can reveal a card with ninjutsu from your hand, pay the ninjutsu cost, and return that attacking creature to its owner's hand
Based on this post from @shiganaimtg, we can expect three separate Secret Lair drops with the following themes: Game Over : Features five cards depicting main story antagonists and final bosses, like Sephiroth, Ultimicia, and Sin
Doing so would be functional errata, which is something Wizards R&D wants to avoid
Always check the card thoroughly before purchasing, and if you have any doubts, do not hesitate to consult an expert