msem-instigator

When Distant Lover enters, create a 1/1 colorless Citizen creature token.

When Brand New Species enters, create a tapped 3/2 green Horror creature token.
Augmented — At the beginning of each end step, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, put a +1/+1 counter on up to one target Horror you control.

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

As an additional cost to cast this spell, exile two cards from your graveyard with the same mana value.
Search your library for a card with the same mana value as the exiled cards, reveal it, put it into your hand, then shuffle.

Target creature gets -3/-3 until end of turn. You gain 3 life.

(Transform this if it's not attached to a creature. Pay {1}{W} as a sorcery to unattach it.)
Enchant creature you control
Mount of Heroes's rider gets +2/+1.
Sacrifice Mount of Heroes: Counter target spell that targets you or Mount of Heroes's rider.

Whenever Queensguard attacks, another target attacking Knight or Soldier gains indestructible until end of turn.

Exile target permanent. Smite the Unruly deals damage equal to that permanent's mana value to its controller and you gain that much life.

This spell costs {2} less to cast if it targets a creature with an Adventure.
Destroy target creature or planeswalker.

Menace
Inspired — Whenever Soul Engulfer becomes untapped, each opponent loses 4 life.

Scry 3. If you control a Wizard, draw a card.

When Arisen Haploc enters, return target creature card from a graveyard to its owner's hand.
Revive {5}{B}{B} ({5}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Dominance — When Viking Packleader enters, create a 2/2 green Wolf creature token if you control the creature with the greatest power or tied for the greatest power.

Lifelink
When Zhehan, the Mediator enters, you may put an Aura card with mana value 3 or less from your hand onto the battlefield attached to a creature it could enchant.

Adorned — As long as Silverwork Champion is equipped and/or enchanted, it gets +2/+2 and has trample.

Vanguard — Whenever a creature you control attacks alone, that creature gets +3/+0 until end of turn.

You may cast What Remains of Samuel Quinn from your graveyard and from the battlefield. It costs {G}{G} more to cast this way.
What Remains of Samuel Quinn enters with your choice of X counters from among +1/+1, vigilance, reach, and trample.

Target player discards two cards.
Fabled {3}{B}{B} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

First strike
When Majestic Monitor enters, if you control a legendary creature, creatures you control get +1/+0 and gain haste until end of turn.

{3}, Reveal Zhedina Outskirts from your hand: Put Zhedina Outskirts from your hand onto the battlefield tapped.
{T}: Add {C}.
{1}, {T}: Add one mana of any color.

Target opponent exiles a card from their hand. If this spell was cast from a graveyard, instead look at that player's hand, you choose a nonland card from it, then exile that card.
Flashback {2}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reach
When Sage of Staves enters, choose one —
• Sage of Staves deals 3 damage to target player or planeswalker.
• Put a +1/+1 counter on target creature you control.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever Flamecloaked Artisan attacks, exile the top card of your library. If it's a nonland card with mana value less than Flamecloaked Artisan's power, you may cast it this turn, and you may cast it as though it had flash.

Flying
Tap two untapped creatures you control: Skymount Commander gains double strike until end of turn.

When Frostfield Swordsman enters, arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)