msem-instigator

Other Vampires you control get +1/+1.
Whenever Irascible Bloodwitch or another Vampire enters under your control, Irascible Bloodwitch deals 1 damage to any target.

Whenever Kessig Jeweler attacks, you may discard a card. If you do, draw a card.
{1}{R}: Transform Kessig Jeweler. Activate only if it's attacking.

At the beginning of your first main phase, you may discard a card. If you do, draw a card and create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
At the beginning of your end step, if Kessig Tombrobber didn't attack this turn, transform it.

When Leyran Spellchainer enters, return target instant or sorcery card from your graveyard to your hand.
{2}{R}: Transform Leyran Spellchainer. Activate only if it's attacking.

Whenever you cast an instant or sorcery spell, you may copy it, and you may choose new targets for the copy. Do this only once each turn.
At the beginning of your end step, if Leyran Spellclaw didn't attack this turn, transform it.

Flying, double strike
Whenever Marzela Falkenrath deals combat damage to a player, create a 1/1 black and red Vampire creature token with menace.
{2}{B}: Vampires you control gain lifelink until end of turn.

Flying
When Obsidian Hellkite dies, it deals 2 damage to up to one target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead.
Foreshadow {4}{R}{R} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Your opponents can't gain life.
If a source you control would deal damage to an opponent, it deals that much damage plus 1 instead.
{3}{R}: Transform Pyromantic Duo. Activate only if it's attacking.

Your opponents can't gain life.
If a source you control would deal damage to an opponent, it deals double that damage instead.
At the beginning of your end step, if Mayhem Tandem didn't attack this turn, transform it.

When Silvershot Crossbow enters, it deals 3 damage to target creature an opponent controls. If that creature is transformed, Silvershot Crossbow deals 13 damage to it instead.
Equipped creature has reach and “{T}: This creature deals 1 damage to each opponent.”
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)

Trample
When Stensia Cavalcade enters, create two Weapon tokens. (They're Equipment artifacts with “Equipped creature gets +1/+1” and equip {2}.)

Whenever you cast an instant, sorcery, or Curse spell, Stromkirk Sangromancer deals 1 damage to each opponent.

Target creature you control gets +2/+0 and gains first strike until end of turn. If you control an artifact, draw a card.

Menace, reach
When Surfacing Horripede enters, surveil 2.

Reach, trample
Tallowkeep enters with two wax counters on it.
Whenever Tallowkeep attacks, remove a wax counter from it. Then if Tallowkeep has no wax counters on it, sacrifice it.
Whenever another artifact you control enters, put a wax counter on Tallowkeep.

Whenever Thunderwolf attacks, exile the top card of your library. You may play that card this turn.

Torch Reveler gets +2/+0 as long as you control an artifact.

Menace
{3}{R}: Transform Troublesome Throng. Activate only if it's attacking.

Menace
At the beginning of your end step, if Vartrossen Vandals didn't attack this turn, transform it.

Starting with the next opponent in turn order, each player sacrifices a permanent. Repeat this process until the total mana value of all permanents sacrificed this way is 13 or greater, or until thirteen or more permanents have been sacrificed this way, or until there are no nonland permanents on the battlefield, whichever happens first. Exile Utter Pandemonium.

Vampiric Vice deals 3 damage to target creature or planeswalker. Vampiric Vice also deals 2 damage to that permanent's controller if you control a Vampire.

Haste
{2}{U}: Volatile Alchemist gains vigilance until end of turn and can't be blocked this turn.

At the beginning of your first main phase, exile the top card of your library. Until end of turn, you may play that card.
Invocation — Whenever you spend four or more mana to cast a spell or activate an ability during your turn, create a 3/1 red Elemental Spirit creature token with trample and haste.

When Voldaren Crypt-Guard enters, create a Weapon token. (It's an Equipment artifact with “Equipped creature gets +1/+1” and equip {2}.)

Attacking creatures you control get +1/+0.
{2}{R}: Return Voldaren Heartslicer from your graveyard to the battlefield transformed under your control attached to target opponent. Activate only as a sorcery.