Shadows of the Past

Invisible Stalker | Creature | Human Rogue | Hexproof (This creature can't be the target of spells or abilities your opponents control.) Invisible Stalker can't be blocked. | Bud Cook

Snapcaster Mage | Creature | Human Wizard | Flash When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.) | Volkan Baǵa

Stitcher's Apprentice | Creature | Homunculus | {1}{U}, {T}: Create a 2/2 blue Homunculus creature token, then sacrifice a creature. | Johann Bodin

Skirsdag High Priest | Creature | Human Cleric | Morbid — {T}, Tap two untapped creatures you control: Create a 5/5 black Demon creature token with flying. Activate only if a creature died this turn. | Jason A. Engle

Mayor of Avabruck | Creature | Human Advisor Werewolf | Other Human creatures you control get +1/+1. At the beginning of each upkeep, if no spells were cast last turn, transform Mayor of Avabruck. | Svetlin Velinov