msem-instigator

Each player discards their hand, then draws cards equal to the greatest number of cards discarded this way.

Search your library for a land card, reveal it, then shuffle and put that card on top. (Then exile this card. You may play the land later from exile.)

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever one or more creatures you control survive damage, add a quest counter.
1 — You may put a creature card with mana value 2 or less from your hand onto the battlefield.
2 — Put two +1/+1 counters on target creature you control.
3 — Choose target creature you control. You draw cards equal to half that creature's power, rounded down.

At the beginning of your upkeep, if you have less life than an opponent, you lose 1 life and you draw a card.

{T}: Add {C}.
{T}, Exile Memorial of the Fallen: Shuffle your graveyard into your library.

Insects you control have hexproof.
At the beginning of your end step, if you control a nontoken Insect, create a 1/1 green Insect creature token.

Draw two cards, then you may discard a card. If you do, target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

(Activate each submodule once as a sorcery. When this enters, activate one submodule for free.)
{U}{U}{U}: Premise
Create a token that's a copy of target creature.
{U}{U}{U}: Inference
Tap all creatures target player controls. Those creatures don't untap during that player's next untap step.
{U}{U}{U}: Conclusion
Logic Module gains “Whenever a creature you control deals combat damage to an opponent, you may draw a card.”

Erratic, erratic, erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order. Repeat this process twice.)

Autumnal Boscage enters tapped unless you control a basic land.
{T}: Add {R} or {G}.

As Horizon of Origins enters, you may reveal an Island or Mountain card from your hand. If you don't, Horizon of Origins enters tapped.
{T}: Add {U} or {R}.

{T}: Add {C}.
Ascend—Tap ten untapped permanents you control. (Tap ten untapped permanents you control: Exile this land, then return it to the battlefield transformed. Ascend only as a sorcery.)

({T}: Add {U} or {R}.)
As Ruptured Falls enters, you may pay {1}. If you don't, Ruptured Falls enters tapped.

Flash
When Ascetic of Imbalance enters, draw two cards, then discard two cards. If you discarded two cards that don't share a type, Ascetic of Imbalance deals 2 damage to any target.

You may sacrifice three Treasures rather than pay this spell's mana cost.
Flying, trample, haste

Flying
{U}, Sacrifice Willow Spirit: Counter target spell or ability that targets you or a creature you control.

Destroy all creatures. For each creature destroyed this way, its controller draws a card.

Trample
When Contentious Yak enters, another target creature you control gets +1/+1 and gains trample until end of turn.

Flying
When Qi-Long Rainbringer enters, return up to one other target creature to its owner's hand.

Flash
Flying
When Gale Conjurant enters, return target spell to its owner's hand if its mana value is less than or equal to the number of creatures in Gale Conjurant's pack. (Two or more creatures you control with equal power are in a pack.)

Whenever a player casts an instant or sorcery spell, Wiedfree Roughrider deals 2 damage to that player.
Whenever Wiedfree Roughrider attacks, you may pay {X}. When you do, destroy target noncreature, nonland permanent with mana value X.

Whenever a land enters, Collapsing Realities deals 2 damage to each player.

Peaceful Passage enters tapped.
{T}: Add {G} or {W}.
{1}, {T}: Add one mana of any color.

Equipped creature gets +1/+1.
Whenever equipped creature attacks, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
Equip {2}

Prevent all damage target spell or permanent would deal this turn. You gain life equal to the damage prevented this way.