msem-instigator

All creatures get -3/-3 until end of turn.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, if a creature would die this turn, exile it instead.

If a creature would die, exile it instead with an ancestry counter on it.
Kahroba gets +X/+X, where X is the total power of creature cards exiled with ancestry counters on them.
At the beginning of your upkeep, if there are four or more cards exiled with ancestry counters on them, transform Kahroba.

Deathtouch
When Bitterheart Bokor leaves the battlefield, you may search your library for a Curse card, reveal it, put it into your hand, then shuffle.

Whenever you cast a noncreature spell, you may shuffle target card an opponent owns in exile into its owner's library.

Repeat the following process X times. Exile a creature you control, then return it to the battlefield under your control.
Exile Lazaire's Conjuring.

Descended Delta enters tapped.
{T}: Add {U} or {R}.
Morph {2} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

When False-Cure Smuggler enters, put a -1/-1 counter on another target creature.
{1}{U}, Sacrifice a creature: Proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

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}

Flying, haste
Whenever you cast an instant or sorcery spell, create a token that's a copy of Stormcall Thunderbird.

Prowess
Whenever Siv Katari, Rebel Technician attacks, create a tapped and attacking X/X colorless Construct artifact creature token with prowess, where X is Siv Katari's power. Exile that token at end of combat.

When Vitality Reclaimer enters, you may return target permanent card from your graveyard to your hand.

Search your library for a card, reveal it, then shuffle and put that card on top.
Kindle 3—{3}{B} ({3}{B}, Exile this card from your graveyard: Create three 1/1 colorless Elemental creature tokens. Kindle only as a sorcery.)

Flying
When Heaven's End Chronicler enters, mill three cards, then choose three cards in your graveyard. An opponent separates them into two piles. Return one pile to your hand.

{T}: Add {C}.
{1}, {T}: Add one mana of any color.

Dawson's Marauder can't block.
When Dawson's Marauder attacks, it can't be blocked this turn unless defending player sacrifices an artifact.

Enchant creature
Enchanted creature gets +1/+1 for each land your team controls.

Whenever you cast a spell during an opponent's turn, Haughty Priest deals 1 damage to that player.

As long as you control three or more artifacts, Treasury Master gets +2/+0 and has slipstream. (This creature can't be blocked as long as only creatures with slipstream are attacking.)

Haste
When Bloodfury Warlord enters or dies, it deals 2 damage to each player.

{T}: Add {G}.

{2}{R}, Sacrifice an artifact or land: Draw a card. Edelber Mine Captain deals 1 damage to each opponent.

As Choked Estuary enters, you may reveal an Island or Swamp card from your hand. If you don't, Choked Estuary enters tapped.
{T}: Add {U} or {B}.

When Soul-Capturing Lantern enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
{1}, {T}: Add one mana of any color.
{6}, {T}, Sacrifice Soul-Capturing Lantern: Exile target nonland permanent. Activate only as a sorcery.

Haste
Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)

When Fetching Gancanagh dies, draw a card. At the beginning of the next end step, up to one target creature you control becomes a copy of Fetching Gancanagh.