msem-instigator

Enchant creature you control
When Brawnsurge enters, enchanted creature deals damage equal to its power to up to one target creature an opponent controls.
Enchanted creature gets +1/+1 and has trample.

Whenever Skitterthorns blocks or becomes blocked, creatures you control gain deathtouch until end of turn.

{T}: Until end of turn, target land is every basic land type in addition to its other types and its name becomes Morphic Sea.

Flash
When Cunning Mimic enters, sacrifice it unless you return another artifact or creature you control to its owner's hand.

Flying
When Endmire Raven dies, each opponent loses 2 life and you gain 2 life.

Flash
Enchant creature
Enchanted creature gets +1/+1 for each enchantment you control.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
1, 2 — Mill two cards.
3 — Return up to two target creature cards from your graveyard to your hand.
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Menace
Once during each of your turns, when you sacrifice a permanent, you may put a +1/+1 counter on Assimilated Runner.

Equipped creatures you control get +1/+1 for each Equipment attached to them.
Whenever Cyrukan's Devoted attacks, create a Weapon token and attach it to target attacking creature you control. (It's an Equipment artifact with equip {2} and “Equipped creature gets +1/+1.”)

Instant and sorcery spells your opponents cast cost {1} more to cast.

Heroic — Whenever you cast a spell that targets Halcyon Hoplite, Halcyon Hoplite gains flying until end of turn.
When Halcyon Hoplite dies, if it was enchanted, create a 1/1 white Bird creature token with flying.

Menace (This creature can't be blocked except by two or more creatures.)
Blood Fiend can't block.
{1}{B}, Pay 3 life: Return Blood Fiend from your graveyard to the battlefield. It gains haste.

When Still-Smoke Skirmisher dies, each opponent loses 1 life and you gain 1 life. Then return Still-Smoke Skirmisher to the battlefield at the beginning of the next end step if it was sacrificed.

When Marauder's Broadsword enters, you may pay {1}. If you do, create a 1/1 white Soldier creature token and attach Marauder's Broadsword to it.
Equipped creature gets +2/+0.
Equip {2}

Create a 3/3 white Construct enchantment creature token.

Destroy target non-Xirix permanent. If that permanent had mana value 6 or greater, take an extra turn after this one.

When Warfan of Changing Winds enters, draw a card.
Whenever a card you own is exiled from anywhere, you may put it on the bottom of your library.

Choose one —
• Create a 2/2 green Wolf creature token. You may discard a card. If you do, draw a card.
• Destroy target artifact.
Flashback {3}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Defender
When Demonrune Wall enters, exile target creature or enchantment an opponent controls until Demonrune Wall leaves the battlefield.

Reveal the top three cards of your library. Put all creature cards revealed this way into your hand and the rest into your graveyard.

{T}: Add {C}.
{4}: Put a +1/+1 counter on Monument of Queens. You may have it become a 0/0 Avatar creature with flying, first strike, vigilance, trample, and lifelink until end of turn. It's still a land.

{2}, {T}, Sacrifice Expedition Map: Search your library for a land card, reveal it, put it into your hand, then shuffle.

At the beginning of combat, each player chooses a creature. Those creatures attack or block this turn if able. Whenever one of those creatures dies this turn, Sweep Stakes deals 3 damage to that creature's controller.

Menace, haste
Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)

Ghastly Castle enters tapped unless another player controls a land that could produce {U} or {B}.
{T}: Add {U} or {B}.