Shadows of the Past

Rally the Peasants | Instant | | Creatures you control get +2/+0 until end of turn. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Jaime Jones

Cackling Counterpart | Instant | | Create a token that's a copy of target creature you control. Flashback {5}{U}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | David Rapoza

Forbidden Alchemy | Instant | | Look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard. Flashback {6}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | David Rapoza

Brimstone Volley | Instant | | Brimstone Volley deals 3 damage to any target. Morbid — Brimstone Volley deals 5 damage instead if a creature died this turn. | Eytan Zana

Gnaw to the Bone | Instant | | You gain 2 life for each creature card in your graveyard. Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Scott Chou