msem-instigator

All creatures get -2/-2 until end of turn.

At the beginning of your upkeep, mill a card.
Whenever you cast a spell from your graveyard, create a 2/2 green Wolf creature token.

This spell costs {1} less to cast for each creature card in your graveyard.

As an additional cost to cast this spell, discard a card.
Draw three cards.

{T}, Pay 2 life: Add {B}.
{T}: Add one mana of any color. Spend this mana only to cast spells from your graveyard or activate abilities of cards in your graveyard.

Until end of turn, target creature you control gains “{T}: This creature deals 1 damage to any target.”
Draw a card.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever you cast an instant or sorcery spell, target creature can't block this turn.

When Goblin Twinblades enters, create a 1/1 red Goblin creature token.

Flying

When Graygulch Turncoat enters, you may post a bounty on target creature. If you do, each opponent loses life equal to the number of bounty counters on creatures. (Put a bounty counter on that creature. It has “When this creature dies, each opponent draws a card” as long as it has a bounty counter on it.)

Enchant creature
When Grip of Paranoia enters, enchanted creature's controller loses 2 life.
Enchanted creature gets -3/-1 and can't block.

Guardian of Dusk gets +X/+X, where X is the amount of life you've lost this turn.
When Guardian of Dusk has power 13 or greater, sacrifice it. If you do, you gain life equal to its power.

Untap up to two permanents you control during each other player's untap step.

Put up to X target noncreature, nonland permanents on top of their owners' libraries in any order.
You gain 6 life.

{2}{B}, Sacrifice a creature: Manifest the bottom card of your library. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Whenever a creature you control is turned face up, it gains deathtouch until end of turn.

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{1}, Sacrifice two Clues: Unlock Hall of Lost Histories and put the revealed card into your hand.

As long as your deck contains only black and colorless cards, your minimum deck size is reduced by eight.

When Halskrow Street Scavenger enters, if a creature died under your control this turn, create a 2/2 green Wolf creature token.

You don't lose unspent mana as steps and phases end except at end of turn.
Hand of the Chroma gets +1/+1 for each color of unspent mana you have.

If a player would gain life, that player adds that much {C} instead.

{W}, Sacrifice Haunting Bard: Destroy target artifact or enchantment.

Heated Dispute deals 3 damage to any target.
Ferocious — This spell costs {2} less to cast if you control a creature with power 4 or greater.

Flying, lifelink

Vigilance
Creature spells you cast cost {2} less to cast.
Other creatures you control can't attack or block.