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If you'd like to cast that DisallowDisallow in your graveyard during someone else's turn, Dralnu is happy to oblige
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
Arachnophobia, Spider Spawning, Spider Umbra, Spidersilk Armor, and Spidery Grasp would all fit in nicely, and I'm sure a handful of other cards could represent less heavy-handed additions