msem-instigator

Whenever Glorybound Chorister attacks, put a +1/+1 counter on each other attacking creature you control.

When Goriana Earthshaker enters the battlefield, you may untap target land you control. It becomes a 3/3 Elemental creature with haste until end of turn. It's still a land.

Grizzled Den enters the battlefield tapped.
{T}: Add {R} or {G}.
{3}{R}{G}: Until end of turn, Grizzled Den becomes a Bear creature with trample in addition to its other types.
Scavenge {4}{R}{G}

When Gruff Smith enters the battlefield, you may destroy target artifact. If you do, that artifact's controller creates a colorless Equipment artifact token with “Equipped creature gets +1/+1” and equip {1}.
Recite {1}{R} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters the battlefield or if it would leave the battlefield.)

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {R} or {G}.

Alpha (You may have this creature enter the battlefield with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Whenever a creature you control attacks alone, target creature an opponent controls blocks this turn if able.

Flying
As long as you control an equipped creature, Guide of Heroes gets +1/+1 and has first strike.
As long as you control an enchanted creature, Guide of Heroes gets +1/+1 and has vigilance.

Haste
Gyr, Awoken World has all activated abilities of other lands you control.
As long as Gyr, Awoken World is on the battlefield or in your graveyard, it's a land in addition to its other types.

Whenever one or more creature cards leave your graveyard, Hadik's Cohort deals 2 damage to target opponent.

Trample
Whenever an opponent casts a noncreature spell for the first time each turn, put a +1/+1 counter on Hadik, Might of Mortals. It gains indestructible until end of turn.
Revive {3}{R}{G} ({3}{R}{G}, Exile this card from your graveyard: Create a token that's a copy of this card, except it has no mana cost. Activate this ability only any time you could cast a sorcery.)

Whenever Heedless Astronaut attacks, it gets +2/+0 and gains indestructible until end of turn.

Heretic's Home enters the battlefield tapped.
{T}: Add {R} or {G}.
When Heretic's Home enters the battlefield, you may put a loyalty counter on a planeswalker you control.

({T}: Add {R} or {G}.)
Highland Vale enters the battlefield tapped.

Wanderlust — Whenever Highwild Survivalist attacks, add {R} or {G}. If you control four or more differently named lands, add {R}{G} instead. Until end of turn, you don't lose mana added this way as steps and phases end.

If a permanent with spirited entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Trample
Harmony — Put a +1/+1 counter on target Warrior you control. You gain 1 life.
Whenever one or more Warriors you control deal combat damage to a player, harmonize. (Trigger up to one harmony of a permanent you control.)

Hymn of Fury deals 1 damage to each creature, then each creature you control gains haste and double strike until end of turn.

Each nontoken land you control has all activated abilities of each other land on the battlefield.
When Idyll leaves the battlefield, until the end of your next turn, you gain “Each nontoken land you control has all activated abilities of each other land on the battlefield.”

Haste
When Inciting Bard enters the battlefield, other creatures you control get +1/+0 and gain haste until end of turn.

{T}, Sacrifice a land: Destroy target land.

Until end of turn, gain control of target creature and it gains haste. Untap it.
Fuse (You may cast one or both halves of this card from your hand.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II, III — Put a +1/+1 counter on target creature you control.
Double the number of counters on target creature you control.
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When Into the Unknown enters the battlefield, create two 1/1 Scout creature tokens that are all colors.
Whenever a land enters the battlefield under your control, if it doesn't have the same name as another land you control, put a +1/+1 counter on each creature you control.

Whenever you cast a creature or planeswalker spell, if mana produced by a nonland permanent was spent to cast it, it gains trample and haste until end of turn.
{T}: Add {R} or {G}.

All lands gain “{T}: Add one mana of any color” and lose all other abilities.