Feast of Succession A true Wrath of God that gives you the monarchy would be busted, because your opponents couldn't contest the throne for two turns unless an opponent has a well-timed haste creature
Having played with and against this card, its much more challenging to play with and against, since people can craft piles with cards like Eternal Witness, Snapcaster Mage, Ravens Crime, or Life from the Loam to basically guarantee access to what they want
I did not see Necromancer's Covenant
The most famous example was Chalice of the Void in Mirrodin , which was a tweaked version of a card Gary Wise turned in for one of his player-designed cards.) The actual design and development was very straightforward
The sphinx Isperia was once the guildmaster of the Azorius Senate on the plane of Ravnica
Pink Horrors are a staple for spell decks now