msem-instigator

Equipped creature gets +2/+0.
Equipped creature has first strike as long as it's attacking.
Equip {2}

Pressure {G} (You may cast this spell for its pressure cost if there are seven or more cards in your graveyard.)
Deathtouch

Flying, haste
Whenever Fang, the Lavaclasm enters or attacks, it deals 2 damage to each other creature.

At the beginning of your upkeep, reveal the top card of your library. If you reveal a creature card this way, put it into your hand.

When Visiting Dignitary enters, gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.

You draw two cards, lose 2 life, then mill two cards.

({T}: Add {W}.)
Moon of the Final Dawn enters tapped.
{1}{W}, {T}: Scry 1.

Sacrifice any number of lands. Search your library for that many basic land cards, put them onto the battlefield, then shuffle.

Exile X target permanents you control. Return them to the battlefield under your control at the beginning of the next end step.
Draw a card.

Aetherize each permanent you control. Exile Beneath the Horizon. (To aetherize a permanent, create a token that's a copy of it, then exile that token.)

Exile target creature. That creature's controller creates a 1/1 white Soldier creature token, then judges that token. (They honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Prismatic — Whenever you cast a multicolored spell, you may discard a card. If you do, draw a card.

First strike
Stampede — Whenever Frenzied Nacatl and a creature with greater power attack, Frenzied Nacatl gets +2/+0 until end of turn.

Haste
Whenever Arisen Hunter attacks, target player loses 2 life and you gain 2 life.
If Arisen Hunter would die, exile it instead.

{T}, Sacrifice a Treasure, Gold, or permanent named Lotus Petal: Add two mana of any one color.
{T}, Sacrifice a Clue or Omen: Scry 2, then draw a card.
{T}, Sacrifice an Idol: Put two +1/+1 counters on target creature.
{T}, Sacrifice a Food: You gain 6 life.
{T}, Sacrifice a Bullet: Alchemos, Efficiency Engine deals 3 damage to any target.

Whenever Soli Arbalist or a nontoken Angel or Nephilim you control enters, amass Soldiers 2. If it was an Angel, amass Soldiers 4 instead. (To amass Soldiers {2}, put two +1/+1 counters on an Army you control. It's also a Soldier. If you don't control one, create a 0/0 black Soldier Army creature token first.)

If one or more +1/+1 counters would be put on a creature you control, put that many +1/+1 counters on each creature you control instead.

You may activate an additional loyalty ability of Nox during your turn as long as Nox or another enchantment you control has entered this turn.
[+1]: You gain life equal to the amount of life lost by target player this turn.
[0]: Target opponent loses 2 life. You gain 2 life.
[–2]: Exile target nonland permanent. You lose life equal to its mana value.

Each creature you control enters with an additional +1/+1 counter on it.
When Training Sim enters, create a Function token with “Target creature you control fights target creature you don't control.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Kicker {W} (You may pay an additional {W} as you cast this spell.)
When Purging Priestess enters, you may destroy target enchantment. If Purging Priestess was kicked, you gain life equal to that enchantment's mana value.

Equipped creature can't have -1/-1 counters put on it.
Equip {1}

Trample
Lumbering Ox gets +1/+1 for each land you control.
At the beginning of your upkeep, reveal the top card of your library. If it's a land card, you may exile it and repeat this process.
You may play cards exiled with Lumbering Ox.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever Centipede Engine attacks, you may have target creature block it this turn if able.

Whenever you cast an instant or sorcery spell, choose a counter on target permanent or player. You may put an additional counter of that kind on that permanent or player.