Each opponent sacrifices a creature with flying.

Return target nonland permanent to its owner's hand. Then that player discards a card if you control a Zombie.

Counter target spell.
Investigate three times. (To investigate, create a colorless Clue artifact token with ", Sacrifice this artifact: Draw a card.")

Investigate, then target creature gets +1/+1 until end of turn for each Clue you control. (To investigate, create a colorless Clue artifact token with ", Sacrifice this artifact: Draw a card.")

At the beginning of each upkeep, if no spells were cast last turn, transform Convicted Killer.

Corrupted Grafstone enters the battlefield tapped.
: Choose a color of a card in your graveyard. Add one mana of that color.

At the beginning of your upkeep, you may mill two cards.
Whenever one or more land cards are put into your graveyard from anywhere for the first time each turn, create a 1/1 green Insect creature token.

At the beginning of your upkeep, each player discards a card. Each opponent who discarded a card that shares a card type with the card you discarded loses 3 life. (Players reveal the discarded cards simultaneously.)

Flying
When Crow of Dark Tidings enters the battlefield or dies, mill two cards. (Put the top two cards of your library into your graveyard.)

Creatures you control have ": Add one mana of any color."

Whenever a permanent you control transforms into a non-Human creature, create a 2/2 green Wolf creature token.

Create two 1/1 red Devil creature tokens. They have "When this creature dies, it deals 1 damage to any target."

When you sacrifice a Clue, transform Daring Sleuth.

, Exile Dauntless Cathar from your graveyard: Create a 1/1 white Spirit creature token with flying. Activate this ability only any time you could cast a sorcery.

Enchant creature
Enchanted creature gets -2/-2.

: Add or .
Delirium — Deathcap Cultivator has deathtouch as long as there are four or more card types among cards in your graveyard.

Exile target creature and all other creatures its controller controls with the same name as that creature. That player investigates for each nontoken creature exiled this way.

When this creature transforms into Demon-Possessed Witch, you may destroy target creature.

Counter target creature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Exile all creatures.
Delirium — Create a 4/4 white Angel creature token with flying if there are four or more card types among cards in your graveyard.