msem-instigator

Trample
Whenever Breaker of Cities deals combat damage to a player, create a 1/1 white Soldier creature token with vigilance.
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Vehicle becomes an artifact creature until end of turn.)

Brutal Struggle deals 2 damage to any target. Put a +1/+1 counter on up to one target creature.

Destroy target land an opponent controls. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.
Draw a card.

Calamitous Rampage deals 5 damage to any target.
Cycling {G} ({G}, Discard this card: Draw a card.)

Permanents entering the battlefield don't cause abilities of permanents to trigger.

Flash
Enchant creature
Enchanted creature gets +3/+3.
Cycling {2} ({2}, Discard this card: Draw a card.)

Haste
Cycling {2} ({2}, Discard this card: Draw a card.)

Assault {1}{G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Caprin Outlander assaults, you gain 3 life.

Whenever another creature you control dies, put a +1/+1 counter on Carnage Gorger.

I, II — Scry 2.
Discovery — Whenever a land you control enters, if it doesn't have the same name as another land you control, draw a card.

Caustic Mangrove enters tapped.
{T}: Add {B} or {G}.
{1}, {T}: Add one mana of any color.

Flying
When Celebrant of Jubilation enters, untap all creatures you control.
Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add {C}.
Civilized — {T}: Add {C}{C}. Activate only if you control an artifact, a creature, and an enchantment.

Cesspool Scrapper can't block.
{5}{U}, Exile Cesspool Scrapper from your graveyard: Draw two cards.

Charred Marsh enters tapped unless you control a Mountain.
{T}: Add {B} or {G}.

Flying

At the beginning of your upkeep, you may discard a card. If you do, draw a card.
At the beginning of your end step, Choking Dunes deals X damage to any target, where X is the number of land cards in your graveyard.

Sacrifice Chromeleon: Add one mana of any color. Scry 1.

When Churning Sandwurms enters, remove all counters from target permanent. Put a +1/+1 counter on Churning Sandwurms for each counter removed this way.

{3}{G}: Search your library and/or graveyard for an Aura card, reveal it, and put it into your hand. If you search your library this way, shuffle.
{1}{U}: Untap target creature.

Draw two cards.
Cycling {2} ({2}, Discard this card: Draw a card.)

Create a 2/2 black Zombie creature token.
Tether (Then if you cast this from your hand, you may exile it tethered to a creature you control. When it dies, you may cast this from exile without paying its mana cost.)

Stampede — Whenever Cloud's Roar Avenger and a creature with greater power attack, tap up to one target creature.

Cloudcover Heights enters tapped unless you control a Forest.
{T}: Add {R} or {W}.

Flying
When Cloudheath Sentinel enters, return target artifact card with mana value 2 or less from your graveyard to the battlefield.