Once an Assassin creature or commander you control deals combat damage to a player in a turn, you can cast spells for their freerunning costs for the rest of that turn
Even a simple +1 from Chandra, Torch of Defiance can mean more cards and more damage
Players may choose new targets for their copies.) Whenever chaos ensues, return up to one target instant or sorcery card from a graveyard to its owner's hand
So maybe Papercraft Decoy, Expedition Map, and Bookwurm
Ill be interested to see what kind of decks end up picking up Serra Paragon, and Id be surprised if it sits on the sidelines for long
Not only does your graveyard need to be pretty full, but you also have to be okay with permanently losing all of those cards you exiled