Dormant Sliver is a trap
Classic card cases typically hold one deck, although there are also variations for multiple decks or those with accessory compartments for dice and other accessories
Heroes, villains, Chocobos, Moogles, and whatever the heck Quina is are all up for grabs, and some could well become top-of-the-format decks
GU Town Ramp Signpost Uncommons: Ignis Scientia and Omega, Heartless Evolution GU wants to take you on an all expenses paid trip to Durdle Town
10 Dovin, Hand Of Control Dovin, Hand Of Control is a part of a cycle of planeswalker cards from War Of The Spark that also comes with a static effect attached to them (but only has minus abilities)
In this case, the spell side provides an infinite-hand-size emblem while drawing you lots of cards, and the Sea Gate, Reborn side is an untapped mana source if needed early on