Scrapbasket

{1}: This creature becomes all colors until end of turn.

Echoing Truth

Return target nonland permanent and all other permanents with the same name as that permanent to their owners' hands.

Scuttlemutt

{T}: Add one mana of any color.
{T}: Target creature becomes the color or colors of your choice until end of turn.

Flux

Each player discards any number of cards, then draws that many cards.
Draw a card.

Dark Ritual

Cabal Ritual

Add {B}{B}{B}.
Threshold — Add {B}{B}{B}{B}{B} instead if seven or more cards are in your graveyard.

Mind Extraction

As an additional cost to cast this spell, sacrifice a creature.
Target player reveals their hand and discards all cards of each of the sacrificed creature's colors.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

Vapor Snag

Return target creature to its owner's hand. Its controller loses 1 life.

Chainer's Edict

Target player sacrifices a creature of their choice.
Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)