msem-instigator

Enchant creature
Spirited (When this enters, you may activate one of its activated abilities without paying its cost.)
{1}: Enchanted creature can't attack or block this turn.

{X}{X}{W}, {T}, Sacrifice Tome of Loss: Return each creature card with mana value X or less from your graveyard to the battlefield.

Exile up to two target artifacts, creatures, and/or enchantments you control. Return those cards to the battlefield under your control at the beginning of the next end step.

For each player, you choose from among the permanents that player controls an artifact, a creature, an enchantment, and a planeswalker. Then each player sacrifices all other nonland permanents they control.

Choose one —
• Each player skips their next combat step.
• Each opponent can't cast instant or sorcery spells this turn.

When Trapped in the Tower enters, exile target creature an opponent controls until Trapped in the Tower leaves the battlefield. (That creature returns under its owner's control.)
When you lose life, sacrifice Trapped in the Tower.

This spell costs {1} less to cast for each card you've drawn this turn.
Create three 1/1 white Soldier creature tokens.

Whenever a creature you control deals combat damage to a player, if it has no +1/+1 counters on it, put a +1/+1 counter on it. You gain 1 life.

When Trident of Benediction enters, create two 1/1 white Merfolk creature tokens.
Equipped creature has vigilance and “Whenever this creature attacks or blocks, creatures you control get +1/+1 until end of turn.”
Equip {2}

Create two 1/1 white Soldier creature tokens with melee. (Whenever that creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)

Destroy target creature with power, toughness, or mana value 4 or greater.

(Transform this if it's not attached to a creature. Pay {2}{W} as a sorcery to unattach it.)
Enchant creature you control
Trusty Steed's rider gets +2/+2.

When Twilight Vigil enters, scry 2, then put a night counter on it.
Death knell — Put a night counter on Twilight Vigil. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)
Sacrifice Twilight Vigil: For each night counter on it, you gain 1 life and trigger up to one death knell of a permanent you control.

Enchant creature
When Twinklewings enters, draw a card.
Enchanted creature has flying.

Creature tokens you control get +1/+1 and have distorted. (They can be blocked by tapped creatures but not untapped creatures.)

Archive 4 (As this enters, shuffle the top four cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, destroy all nonland permanents you don't control with the same mana value as the drawn card.

You may pay {W} and tap an untapped Monk you control rather than pay this spell's mana cost.
The next 3 damage that would be dealt to you and/or permanents you control this turn is dealt to any target instead.

When Unbound Expanse enters, if an opponent controls more lands than you, create a Plains token. (It's a basic land with “{T}: Add {W}.”)
{1}{W}, Sacrifice Unbound Expanse: Exile each nonland permanent you control, then return those cards to the battlefield under your control.

Destroy target artifact or enchantment. You gain life equal to its mana value.

Whenever a creature you control is dealt damage, put a +1/+1 counter on that creature.

When Uncovered Secrets enters, search your library for an artifact card, reveal that card, then shuffle and put that card on top.
Concord — Creatures you control get +1/+1 as long as there are four or more card types among permanents you control.

Return up to two target creature cards with total mana value 4 or less from your graveyard to the battlefield.

Create three 1/1 colorless Servo artifact creature tokens.
Exile Unending Armies. At the beginning of your upkeep, if you have more life than each opponent, you may cast it without paying its mana cost. Otherwise, put it into your graveyard.

Exile target nonland permanent if its mana value is less than or equal to the number of creatures you control.
Lifecycle {3} ({3}, Discard this card: Create two tapped 1/1 colorless Elemental creature tokens.)

When Unite Against Evil enters, return target creature card with mana value 3 or less from your graveyard to the battlefield.
Menagerie — Whenever you attack, if there are five or more creature types among creatures you control, put a +1/+1 counter on target attacking creature and untap it.