msem-instigator

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.

Non-Actor creatures can't block this turn.

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

{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.

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

Trample
Bessie's Crusher has haste as long as you control another Wurm.

Menace
When Bit Player dies, it deals 1 damage to each opponent.

{4}{R}: Blind Tunneler gets +3/+0 until end of turn.

Draw a card for each creature that died this turn.

As long as you've gained life this turn, Bloodied Outcast gets +1/+0 and has lifelink.
As long as an opponent has lost life this turn, Bloodied Outcast gets +0/+1 and has deathtouch.

Bloodline Zealot gets +2/+0 and has menace as long as you've sacrificed a permanent this turn.

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Bounty Crusher has trample as long as it's being blocked by a marked creature.

As Brave the Issbarrens enters, choose a color.
White creatures you control have protection from the chosen color. (This permanent can't be targeted, dealt damage, enchanted, or equipped by anything with that color.)

Enchant creature
Enchanted creature gets +2/+2 as long as it's an Actor. Otherwise, it gets -2/-2.

Flying, trample
Whenever Bretala of Redsky attacks, it gains double strike until end of turn unless defending player sacrifices a creature.

Tap up to four target nonland permanents. Nonland permanents your opponents control don't untap during their controller's next untap step.

({T}: Add {W}.)
Bustling Docks enters tapped.
{W}, {T}, Reveal a white card from your hand: Target creature gets +1/+0 until end of turn.

Creatures you control get +0/+1 and can attack as though they didn't have defender.
Whenever three or more creatures you control attack or block, each creature you control assigns combat damage equal to its toughness rather than its power this turn.

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Whenever a marked creature you don't control blocks, Cadalon Chemist deals 1 damage to that creature.

Whenever you investigate for the first time each turn, investigate an additional time.
{T}, Sacrifice an artifact: Cadalon Inspector deals 2 damage to any target.

Destroy all artifacts with mana value X or less. Whenever an artifact is destroyed this way, Calamitous Crash deals 1 damage to any target.

Reach
Canopy Scout gets +1/+0 for each land card in your graveyard.

Creatures you control have haste and attack each combat if able.
Attacking Soldiers you control get +1/+0.

Chamber of Splendor enters tapped.
When Chamber of Splendor enters, you may pay {1}. If you do, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
{T}: Add {C}.