I've never posted here before, but inspiration suddently struck as I was heading home from work on the subway. Perhaps unsurprisingly, all these card names are derived from legal terminology, although some of them are very obscure.
Writ of Habeas Corpus
1{W}{W}
Enchantment

, Sacrifice Writ of Habeas Corpus: Return target creature from your graveyard to play. If a spell or ability had destroyed that creature, it gains protection from the color(s) of that spell or ability.
Writ of Habeas Corpus
1{W}{W}
Enchantment
, Sacrifice Writ of Habeas Corpus: If target creature would be destroyed by a spell or ability this turn, it gains protection from the color(s) of that spell or ability instead.Writ of Replevin
1{R}{R}
Enchantment

, Sacrifice Writ of Replevin: Gain control of all permanents you own. For each permanent that comes under your control as a result of this ability, draw a card. Draw a card.
Writ of Replevin
1{R}{R}
Enchantment
, Sacrifice Writ of Replevin: Gain control of all permanents you own. For each permanent that comes under your control as a result of this ability, draw a card. Draw a card.Writ of Cognovit
1{B}{B}
Enchantment
Spells and abilities you control can't target spells or permanents controlled by an opponent.
During your upkeep, choose lands, artifacts, enchantments or creatures. Until end of turn, whenever you play a permanent of the chosen type, you may pay [1] or 1 life. If you do, draw a card.
Writ of Cognovit
1{B}{B}
Enchantment
Spells and abilities you control can't target spells or permanents controlled by an opponent.
During your upkeep, choose lands, artifacts, enchantments or creatures. Until end of turn, whenever you play a permanent of the chosen type, you may pay 1 life. If you do, draw a card.Writ of Mandamus
1{U}{U}
Enchantment
1{U}{U}, Discard a card: Change the target of an ability that targets you and/or a creature you control to any new target(s) of your choice. All new targets must be legal, and the number of new targets must be equal to the original number of targets.
Writ of Mandamus
1{U}{U}
Enchantment
1{U}{U}, Discard a card: Change the target of an ability that targets you and/or a creature you control to any new target(s) of your choice. All new targets must be legal, and the number of new targets must be equal to the original number of targets.Writ of Detinue
1{G}{G}
Enchantment

, Sacrifice Writ of Detinue: Return two cards from your graveyard to your hand.
Writ of Detinue
1{G}{G}
Enchantment
, Sacrifice Writ of Detinue: You and your opponent both choose a card in your graveyard. Return one of those cards to your hand and the other to the top of your library.