msem-instigator

{T}, Mill a card: Add {B} or {G}.
Once each turn, when a creature you control dies or a creature card is put into your graveyard from anywhere other than the battlefield, each opponent loses 1 life.

At the beginning of your end step, aetherize target permanent you control. (To aetherize, create a token that's a copy of it, then exile that token.)

At the beginning of your upkeep, you may pay {B}. If you do, return a Wizard card from your graveyard to your hand.

{T}: Add {C}.
{2}{G}, {T}: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
At the beginning of combat on your turn, if you control ten or more lands, you may pay {3}{G}{G} and exile this land. When you do, untap any number of lands you control. They become 2/2 green Elf creatures with haste in addition to their other types.

Whenever Arisen Rider attacks, creatures your opponents control get -1/-1 until end of turn.
If Arisen Rider or another creature or planeswalker would die, exile it instead.

Trample
Spells and abilities your opponents control can't cause you to sacrifice Colossal Achievement.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Audition for green. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Warrior Role giving 3/2 and trample. Roles replace older ones.)
III — Creatures you control get +1/+0 and gain trample until end of turn.
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Non-Avatar creatures can't attack you or planeswalkers you control unless their controller pays {2} for each of those creatures.

Whenever another creature you control enters, this creature gets +1/+1 until end of turn. The first time each turn a nontoken Citizen or Peasant entering causes this ability to trigger, instead create a 1/1 white Peasant creature token.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Audition for blue. (Create a 1/1 Construct Actor creature token, a Wizard Role giving 2/2 and prowess, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)
III — Whenever a creature you control deals combat damage to a player this turn, draw a card.
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When Ontarachie Emissary leaves the battlefield, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Flying
When Tempest Stormcaster enters, if a permanent you control left the battlefield this turn, you may have target player draw a card.

{T}: Add {C}.
{3}{U}: Until end of turn, I's Observatory becomes a 1/4 creature. It's still a land. It has menace if {B} was spent to activate this ability, has first strike if {R} was spent, and assigns combat damage equal to its toughness rather than its power if {G} was spent.

Flying, prowess
Whenever you cast a noncreature spell, reveal the bottom two cards of your library. Target opponent chooses one of them. Put that card on the bottom of your library and the rest into your hand.

Flying
When Owl of the Seven Stars enters, scry 2.

When Acolyte of Night dies, each opponent loses 1 life.

When Bjarndyr Outfitter enters, arm up to two target creatures you control. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Whenever a Soldier or Knight you control enters, you may sacrifice Ceanne's Dawnbringer. If you do, put your choice of two different counters on that creature from among +1/+1, first strike, lifelink, and vigilance.

Enchant creature
You control enchanted creature.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Create a token that's a copy of target Construct you control.
III — Constructs you control get +2/+0 and gain vigilance until end of turn.
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Whenever you cast a noncreature spell, Wild Pyromancer gets +1/+1 until end of turn.
Whenever Wild Pyromancer attacks, you may pay {2}{R}. If you do, transform Wild Pyromancer.

Whenever you cast an instant or sorcery spell, tap target creature an opponent controls.

Whenever a creature you control is dealt damage, it gains indestructible until end of turn. (If it survives.)

Reach
Whenever you cast a spell with mana value 5 or greater, Reaper Squad deals 3 damage to target player or planeswalker.

{4}, {T}: Put a -1/-1 counter on target creature.
{4}, {T}: Remove a -1/-1 counter from target creature.