Each Set Booster contains 12 Magic cards, 1 Art Card, and 1 token, ad card, counter punchout card, or special card from Magics history (a card from The List)
These cards were split up into two decks which Garfield used for playtesting with Barry "Bit" Reich
If another player gains control of Lightning, you won't be able to play any of the exiled cards, even if you later regain control of Lightning
However, unlike Oblivion Rings abilities, this ability creates two one-shot effects: one that exiles the creature when the ability resolves, and another that returns the exiled card to the battlefield immediately after the Sliver leaves the battlefield
From Mirage on, the standard for booster boxes became 36 booster packs per box
1 Rather than trying to imagine a vast matrix with the card in question compared to all of the removal in Magic, an impossible task, we use a shortcut: on average, our opponents will probably remove our threats for roughly a three mana investment at sorcery speed