msem-instigator

Colossal 4—{8} (You may cast this for its colossal cost to have it enter with four +1/+1 counters; or pay {8} as a sorcery: Put four +1/+1 counters on it if it has none.)
Abilities you activate that aren't mana abilities cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.

Vigilance
When Envoy of Karametra enters, for each kind of counter on target permanent, put another counter of that kind on it or remove one from it.

Enspirit (As you cast this spell, you may exile a nonenchantment creature you control until this leaves the battlefield or fails to resolve. Reduce this spell's cost by the exiled card's mana value.)
Trample

Choose two —
• Target creature gets -2/-2 until end of turn.
• You gain 2 life.
• Amass Soldiers 1. (Put a +1/+1 counter on an Army you control. It's also a Soldier. If you don't control one, create an 0/0 black Soldier Army creature token first.)

Friend of the Woods has hexproof as long as it has a +1/+1 counter on it.
{1}{G}, {T}: Put a +1/+1 counter on Friend of the Woods.

Whenever an opponent casts a spell during your turn or finishes drawing cards during your turn, you gain 1 life and create a Treasure token.
Sacrifice two Treasures: Draw a card.

Whenever Spiritual Heir deals combat damage to a player, you may search your library for a card named Spiritual Heir, reveal it, put it into your hand, then shuffle.

When Ethersketch Blueprints enters, create a 1/1 blue Thopter artifact creature token with flying.
{2}, Sacrifice Ethersketch Blueprints: Draw a card.
Monument {5}{B}{B} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)
Ascend {4}{W} ({4}{W}: Exile this permanent, then return it to the battlefield transformed. Ascend only as a sorcery.)

When Golna, the First Shah enters, create Shir, a legendary 3/3 white Cat creature token with trample.
Monument {5}{G}{G} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

You may cast target card in an opponent's graveyard without paying its mana cost.
Flashback {4}{B}{G}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{T}: Add {C}.
{T}, Tap an untapped artifact, creature, or land you control: Add one mana of any color.
{T}: Choose a card name, then reveal the top card of your library. If that card has the chosen name, you may sacrifice Sealed Archives and draw a card.

Return target creature to its owner's hand. You may shuffle up to four target cards from your graveyard into your library.

Exile two cards from your graveyard: Petrified Guard becomes a 3/1 Zombie creature until end of turn.

Prowess
Pay 2 life: Change a target of target spell or ability to Straw Intellectual.

When Jobiah, Devoted Farmer enters, search your library for a land card, put it onto the battlefield tapped, then shuffle.
At the beginning of your upkeep, if you control six or more lands with different names, you may transform Jobiah.

Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
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.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Reveal the top two cards of your library. Put up to one land card from among them onto the battlefield and the rest into your graveyard.
III — Until end of turn, target creature gets +X/+0 and gains indestructible, where X is the number of lands you control.

Attacking creatures you control have trample.
Whenever a creature you control attacks, you may remove any number of +1/+1 counters from that creature. If you do, it gets +2/+2 until end of turn for each counter removed this way.

Counter target spell unless its controller pays {1} for each card in their graveyard.

({T}: Add {B}.)
Shadowed Slums enters tapped.
{B}, {T}, Reveal a black card from your hand: Target player loses 1 life.

{2}{B}, Exile Barbed Cocoon from your graveyard: Create two 1/1 green Insect creature tokens. Activate only as a sorcery.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Avaz Rising enters, return target creature card from your graveyard to the battlefield. That creature becomes an Army in addition to its other types.

Kinsang Shrine enters tapped.
{T}: Add {B} or {G}.
{B/G}, {T}, Sacrifice Kinsang Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Whenever a creature dies, create a 1/1 red and green Warrior creature token if this is the first time this ability has resolved this turn. Otherwise, you draw a card and you lose 1 life.

{T}: Add one mana of any color in your commander's color identity.