Shadows of the Past

Gutter Grime | Enchantment | | Whenever a nontoken creature you control dies, put a slime counter on Gutter Grime, then create a green Ooze creature token with "This creature's power and toughness are each equal to the number of slime counters on Gutter Grime." | Erica Yang

Hollowhenge Scavenger | Creature | Elemental | Morbid — When Hollowhenge Scavenger enters the battlefield, if a creature died this turn, you gain 5 life. | Slawomir Maniak

Spider Spawning | Sorcery | | Create a 1/2 green Spider creature token with reach for each creature card in your graveyard. Flashback {6}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.) | Daniel Ljunggren

Sigarda, Host of Herons | Legendary Creature | Angel | Flying, hexproof Spells and abilities your opponents control can't cause you to sacrifice permanents. | Chris Rahn