msem-instigator

Desecrate (When this creature enters, you may sacrifice an artifact or land.)
When Back-Alley Vandal desecrates a permanent, put a +1/+1 counter on Back-Alley Vandal.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Whenever Backalley Silencer deals combat damage to a player, destroy target marked creature.

You may cast target instant card from your graveyard this turn. If a card cast this way would be put into your graveyard, exile it instead.

Haste
When Backdrop Artisan dies, audition for red. (Create a 1/1 Construct Actor creature token, a Warrior Role giving 3/2 and trample, or a Wizard Role giving 2/2 and prowess. Roles replace older ones.)

Target tapped creature gets -3/-3 until end of turn.

Backstabbing Courtiers can't attack unless you foretold a card or cast a foretold spell this turn.

Non-Actor creatures can't block this turn.

When Backstage Broken enters, create a 1/1 colorless Construct Actor creature token.
Whenever a token you control leaves the battlefield, you gain 1 life.

Deathtouch
When Backstage Comic enters, target player discards a card.

Lifelink
At the beginning of your end step, if you gained life this turn, put a +1/+1 counter on Backstage Manager.

Lifelink
Whenever Backstage Prompter deals combat damage to a player, put a +1/+1 counter on it.

{T}, Pay 1 life: Add {R} or {W}.
{1}, {T}, Sacrifice Backstage Rooms: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

When Backstage Tinkers enters, you may return an artifact card from your graveyard to your hand.

Whenever Backstreet Gutter-Runner attacks, if you control another Pirate or Rogue, it deals 2 damage to each opponent.

Basic Forests you control have “{G}, {T}: Untap target attacking creature and remove it from combat.”

Menace, haste

Flying
{B/G}, Discard a creature card: Badru, the Skyshadow becomes a copy of the discarded card until end of turn, except he has flying and is 5/5.

Deathtouch
Bahet's Emissary gets +1/+1 as long as you control a white or black permanent.

Scry X, then purge X times. You lose X life. (To purge, exile two cards that share a type from graveyards. If you do, draw a card.)

Destroy target creature. Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

{W}{B}{G}, Discard a card named Bahet, God of Destruction: Bahet gains indestructible and becomes a God creature in addition to its other types.
Whenever Bahet enters or attacks, each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice non-God creatures the same way.

Choose two —
• Destroy up to one target enchantment.
• Exile up to one target card from a graveyard.
• You gain 4 life.
Cycling {1}{W} ({1}{W}, Discard this card: Draw a card.)

As an additional cost to cast this spell, discard your hand.
Purge four times, then you gain 1 life for each card in exile. (Exile two cards that share a type from graveyards. If you do, draw a card.)

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
Flying
{1}{W}: Demigod — Return up to one target creature card with mana value 2 or less from your graveyard to the battlefield.
{3}{W}: God — Put a +1/+1 counter on each creature you control with the least power among creatures you control.