msem-instigator

Merciless Champion can't block unless you control another Knight or Soldier.

[+2]: Create two 0/0 colorless Reflection creature tokens.
[–2]: Distribute four +1/+1 counters among any number of target creatures you control. You may tap or untap each of those creatures.
[–7]: You get an emblem with “Creature tokens you control can't leave the battlefield.”

When Harshapal Banner enters, create three 1/1 white Soldier creature tokens with vigilance.
Equipped creature gets +2/+2.
Equip {3}

When this artifact enters or equipped creature attacks, you may discard a card and note its mana value until end of turn. If you do, draw a card.
Equipped creature gets +X/+1, where X is the greatest mana value noted with this artifact. (If there isn't one, it gets +0/+1.)
Equip {3}

Sacrifice Shadowfeeder: Target player loses 1 life and you gain 1 life.

When Affluent Host dies, it deals 1 damage to each opponent. Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
Foreshadow {2}{R} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

({T}: Add {R} or {G}.)
Autumn Canopy enters tapped.
{1}, {T}: Add {R}{R} or {G}{G}.

Create two 1/1 colorless Samurai creature token. Those creatures gain first strike until end of turn.

Gain control of target attacking creature until end of turn. Untap it. It gains indestructible until end of turn.

Whenever a creature attacks you or a planeswalker you control, that creature's controller mills a card.

Create a 1/1 white Soldier creature token. Then put a +1/+1 counter on a creature you control.

Choose one —
• Draw two cards, then discard a card.
• Counter target spell unless its controller pays {3}.

When Empire's Glory enters, draw a card, then choose a card name.
Whenever a creature with the chosen name you control enters, put a +1/+1 counter on each creature you control that shares a creature type with it. Those creatures gain haste until end of turn.

{2}: Avaricious Ghul gets +1/+1 until end of turn. If mana from a Treasure was spent to activate this ability, put a +1/+1 counter on Avaricious Ghul instead.

Flash
When Duplicated Dismantler enters, if you cast another spell this turn, return target spell to its owner's hand.

Discard your hand, then draw three cards. If you spent at least {W}{U}{B}{R}{G} to cast this spell, you may cast any number of cards drawn this way without paying their mana costs.
Exile Face Your Demons.

Flying
Spells you cast from anywhere other than your hand cost {2} less to cast.
Spells your opponents cast from anywhere other than their hand cost {2} more to cast.

This spell costs {1} less to cast if you've cast another spell this turn.
Destroy target creature.

Counter target activated or triggered ability.
Metamorph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Trample

Hazy Coppice enters tapped.
{T}: Add {U} or {B}.
{2}{U}{B}: Until end of turn, Hazy Coppice becomes a 4/4 blue and black Bird creature with with flying and “Whenever this creature attacks or blocks, torment yourself.” It's still a land. (To torment yourself, lose 3 life unless you discard a card or sacrifice a nonland permanent.)

Rhapsody {4}{R}{R} (Pay {4}{R}{R} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
Menace

{1}, Sacrifice a creature: Ever-Hungry Tanbaly gains indestructible until end of turn. Tap it.

At the beginning of your end step, choose any number of permanents and/or players, then give each another counter of each kind it already has.
[+1]: Scry 1. Add {U} or {R}.
[–X]: Exile the top X cards of your library. Until end of turn, you may play a card exiled with Trainee Karina Oblay.

Prowess
Landfall — Whenever a land you control enters, create a 1/1 green, blue, and red Elf Scout creature token with prowess.