How about 3 mana instead
This allows you to sacrifice both a creature and any Aura that is on it all at once
Grim Reapers Sprint is a flavourful interpretation of the perk it gets its name from in the Fallout games, which restores Action Points after slaying an enemy with V.A.T.S
If this card is used later in the game, when several dragons (tokens) have already found their way into the game and are destroyed or targeted, good damage can be generated
Ghirapur Orrery helps you dump your hand and then refills it for you
We had very little sense of the role Phyrexia played in the story on the cards, who Yawgmoth was, how Mishra and Urza related to various factions, or even how places like Lat-Nam, Argive, and Argoth related to other places we learned about in Limited Edition or in subsequent sets, like Legends and The Dark