msem-instigator

Equipped creature gets +1/+0 and has “Whenever this creature becomes tapped, you gain 1 life.”
Equip {2}

Creatures you control get +1/+1 until end of turn. Token creatures you control get an additional +1/+1 until end of turn.

Equipped creature gets +1/+1 and has haste.
Whenever a creature you control enters, if it was cast from exile, you may attach Blade of the Valiant to it.
Equip {2}

Target instant or sorcery card in your graveyard gains flashback until end of turn. Its flashback cost is equal to its mana cost reduced by {2}.
Conjure a card named Fatigue and put it on top of your library. (It's a colorless sorcery that costs {2} with “Draw a card.”)

Flying
Whenever Olivia Voldaren, Progenitrix attacks, you may discard a card. If you do, draw a card.
Whenever you discard a creature card, put a +1/+1 counter on Olivia Voldaren, Progenitrix and create a 1/1 black and red Vampire creature token with menace.

Cryptic Reef enters tapped.
{T}: Add {G} or {U}.
{2}{G}{U}, {T}, Sacrifice Cryptic Reef: Draw a card.

Create three 1/1 colorless Construct Actor creature tokens.

Flying, lifelink, haste
At the beginning of the end step, sacrifice Helix Entity.

Skin from Bone deals damage to target creature equal to your fealty to Mountains. (Each Mountain you control counts towards your fealty to Mountains.)

{T}: Add {R}. Put a charge counter on Wistful Automaton.
Remove three charge counters from Wistful Automaton: Transform it.

When Village Courier enters, look at the top four cards of your library. You may reveal an artifact, enchantment, or land card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Target player reveals their hand. You choose three cards from it and exile them. Then that player exiles the top three cards of their library.

Whenever Patron of Asham attacks, tap target creature an opponent controls with power less than or equal to your fealty to Plains. (Each Plains you control counts towards your fealty to Plains.)

{U}, Give yourself a lore counter: Scry 1. This ability costs {2} more to activate for each lore counter you have.
{6}{U}, Remove three lore counters from yourself, Sacrifice Harbinger of Giradrus: Draw seven cards, then create two 4/4 red Dragon creature tokens with flying.

Create a 2/2 white Knight creature token with vigilance, then populate. (Create a token that's a copy of a creature token you control.)

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
Discard up to two cards, then draw that many cards plus one.

As an additional cost to cast this spell, sacrifice a land.
You may put a land card you own from outside the game onto the battlefield.

You have no maximum hand size.
Whenever Makodonis's Wolfbro attacks, if its power is greater than its base power, draw cards equal to the difference.

Flying, lifelink
Whenever you gain life, each opponent loses 1 life.
{4}{B}{B}: Create a 1/1 black Vampire creature token with lifelink for each nontoken creature that died this turn.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Crisis in Kaneh enters, destroy up to one target creature or planeswalker.

When Dawnhart Ceremony enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Invocation — When you spend four or more mana to cast a spell or activate an ability during your turn, transform Dawnhart Ceremony.

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Return each nonland permanent your opponents control to its owner's hand.

Creatures you control attacking causes their death knell to trigger.
Death knell — Indomitable Spirit gets +2/+2 and gains trample until end of turn. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

Return target creature card from your graveyard to the battlefield.
Fabled {2}{B} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that creature.)