Flying, lifelink Fallen Celestial can't block or be blocked by Angels, Demons, or Faeries. At the beginning of each opponent's upkeep, that player loses 1 life and creates a 1/1 black Faerie creature token with flying.
When Festering Shipwreck enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”) At the beginning of each player's upkeep, that player sacrifices a nonland permanent.
When Lifespark Alchemist enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”) Whenever Lifespark Alchemist or another creature dies, each opponent loses 1 life.
When Night Howlers enters, target opponent reveals three cards from their hand and you choose one of them. Exile that card until Night Howlers leaves the battlefield.
Enchant creature {X}{B}: Enchanted creature gets +X/+X until end of turn. When enchanted creature dies, return it to the battlefield under your control.
Enchant creature When Selfish Epiphany enters, search your library for a card and put that card into your hand. Then shuffle. Enchanted creature has indestructible and can't be sacrificed.
“Neither my death nor yours will redeem you. That was only the wish of those who have always hated us.”
You draw a card, lose 2 life, then create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Target player sacrifices a creature. Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)