Tourmenter

At the beginning of your upkeep, put a shred counter on Cephalid Vandal. Then mill a card for each shred counter on Cephalid Vandal.

Target player draws two cards. Flashback—{1}{U}, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Discard a card: Switch Aquamoeba's power and toughness until end of turn.

Flying {B}: Balshan Collaborator gets +1/+1 until end of turn.

As an additional cost to cast this spell, discard X cards. Return X target nonland permanents to their owners' hands.

Flying Discard a card: Return Skywing Aven to its owner's hand.

Flying Threshold — As long as seven or more cards are in your graveyard, Possessed Aven gets +1/+1, is black, and has "{2}{B}, {T}: Destroy target ...

Until end of turn, if target player would draw a card, instead that player skips that draw and you draw a card.