msem-instigator

Menace
Creatures you control with mana value 1 get +2/+0 and have menace.

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Whenever a marked creature dies, you lose 1 life and you draw a card.

Reach, vigilance
When Amorphous Tyrant enters, another target creature you control deals damage equal to its power to target creature or planeswalker you don't control.
Evoke {G} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

{1}{G}, Sacrifice Caustic Caterpillar: Destroy target artifact or enchantment.

If you would draw one or more cards, you may have each player draw an additional card.
Spells cost {1} less to cast if a player cast a spell this turn.

Protection from Clerics (This creature can't be blocked, targeted or dealt damage by Clerics.)

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

When Deliver from Dilapidation enters, you may sacrifice any number of enchantments. Whenever you sacrifice an enchantment this way, destroy target creature.
At the beginning of your upkeep, return target enchantment card with mana value 5 or less from your graveyard to the battlefield.

{R}, {T}, Exert Provoker of Mountains: Create an X/X red Elemental creature token, where X is the number of spells you've cast this turn. (An exerted creature won't untap during your next untap step.)
{X}{X}{R}, {T}, Sacrifice Provoker of Mountains: Provoker of Mountains deals X damage to any target.

This spell costs {W} less to cast if it targets a black or red permanent.
Exile target nonland permanent with mana value 3 or less.

{T}: Add {C}.
{3}, {T}, Sacrifice Hall of Random Access Memories: Return target artifact, instant, or sorcery card from your graveyard to your hand.

Whenever one or more cards leave your graveyard, put a +1/+1 counter on Seagraf Shamblers.

This spell costs {1} less to cast for each creature you attacked with this turn. (Those creatures don't have to still be on the battlefield.)
Flying

Blessed Grounds enters tapped. When it enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{T}: Add {G} or {W}.

At the beginning of your upkeep, you lose 1 life, then audition for black. (Create a 1/1 Construct Actor creature token, a Cleric Role giving 2/2 and lifelink, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)

Trample
Whenever Komurk Harvester or another creature you control dies, draw cards equal to that creature's power.

{T}: Add one mana of any color.
When you tap Derelict Town for mana, return it to its owner's hand.

Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{5}{U/B}{U/B}: Gain control of target creature with mana value 3 or less until Dollmaster leaves the battlefield.

When Mass Orator enters, if it isn't a token, populate. (Create a token that's a copy of a creature token you control.)
Creature tokens you control get +1/+1.

Sacrifice Amateur Auteur: Destroy target enchantment.

Indestructible (Damage and effects that say “destroy” don't destroy this creature.)
Whenever Declare, the Mother Bear deals combat damage to a player, put a +1/+1 counter on it.

Flying
Whenever you cycle Seraph of the Stage or it attacks, audition for white. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Cleric Role giving 2/2 and lifelink. Roles replace older ones.)
Basic landcycling {1}{W} ({1}{W}, Discard this card: Search your library for a basic land card, reveal it, and put it into your hand, then shuffle.)

At the beginning of each end step, you gain X life and each opponent loses X life, where X is the number of times you gained life this turn.
{2}{B}: Darksand Acolyte gains indestructible and lifelink until end of turn.

Whenever Hopeless Romantic or another creature you control dies, each opponent loses 1 life.
Attain {3}{B} ({3}{B}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Creature spells cost {1} more to cast.
At the beginning of your upkeep, put a decay counter on Stonewood Sanctuary. Then if it has three or more decay counters on it, sacrifice it.