Shadows of the Past

Divine Reckoning | Sorcery | | Each player chooses a creature they control. Destroy the rest. Flashback {5}{W}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Greg Staples

Mystic Retrieval | Sorcery | | Return target instant or sorcery card from your graveyard to your hand. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Scott Chou

Barter in Blood | Sorcery | | Each player sacrifices two creatures. | Eric Deschamps

Sever the Bloodline | Sorcery | | Exile target creature and all other creatures with the same name as that creature. Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Clint Cearley

Past in Flames | Sorcery | | Each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. Flashback {4}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Anthony Jones