Detention Sphere [Return to Ravnica] XY73 Even the wicked have nightmares

Even the wicked have nightmares

if there are four or more card types among cards in your graveyard

or target them with card effects

If this card is Tributed by a card's effect and sent to the Graveyard

during the next End Phase of the opponent of the player who placed a 1String Counter(s) by this effect: Destroy the monsters with String Counters

Detention Sphere [Return to Ravnica] XY73 Even the wicked have nightmaresSet: Return to Ravnica Type: Enchantment Rarity: Rare Cost: {1}{W}{U} When Detention Sphere enters the battlefield, you may exile target nonland permanent not named Detention Sphere and all other permanents with the same name as that permanent. When Detention Sphere leaves the battlefield, return the exiled cards to the battlefield under their owner's control.