msem-instigator

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

When Rod of Marble Row enters the battlefield, you may return target creature to its owner's hand.
Equipped creature gets +1/+1.
Equip {1}

Scry 2, then draw two cards. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Flash
Flying
When Seeker Amalgam enters the battlefield, you may counter target spell with mana value less than or equal to the number of Elementals you control.

Counter target noncreature spell unless its controller pays {2}.

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

When Wealthy Merchants enters the battlefield, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

(As this Discovery enters and after your draw step, add a progress counter. Stop after you've discovered.)
I, II — Draw a card.
Discovery — Noncreature spells you cast cost {1} less to cast.

Civilized — Adorned Naga gets +2/+0 and has menace as long as you control an artifact, a creature, and an enchantment.

(As this Discovery enters and after your draw step, add a progress counter. Stop after you've discovered.)
I, II — Return target creature card from your graveyard to your hand.
Discovery — {2}{B}, Sacrifice a creature: Each opponent loses 2 life and you gain 2 life.

Flying, trample
When Ashen Persecutor enters the battlefield, target opponent reveals their hand. You choose a nonland card from it. That player discards that card and you gain life equal to its mana value.

Destroy target creature.
Civilized — You gain 3 life if you control an artifact, a creature, and an enchantment.

Enchant land
Enchanted land has “{T}: Each opponent loses 2 life.”

Assault {1}{B} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Bone Mesa Marauder assaults, it gains flying until end of turn.

Flying

When Churning Sandwurms enters the battlefield, remove all counters from target permanent. Put a +1/+1 counter on Churning Sandwurms for each counter removed this way.

{T}, Remove a +1/+1 counter from a creature you control: You draw a card and you lose 1 life.

When Crooked Merchant dies, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

When Death Pits Trophy enters the battlefield, target opponent discards a card.
Equipped creature gets +1/+1.
Equip {1}

Assault {1}{B} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
Whenever a creature you control assaults, you may have target creature get -2/-2 until end of turn.

[+1]: Create a tapped colorless Bullet artifact token with “{T}, Sacrifice this artifact: It deals 1 damage to any target.”
[–1]: Exile target creature or planeswalker that was dealt damage this turn.
[–7]: You get an emblem with “At the beginning of each end step, you may draw X cards, where X is the amount of life your opponents lost this turn.”

Choose one —
• Each opponent sacrifices a nonlegendary creature.
• Each opponent sacrifices a legendary creature or planeswalker.

Sacrifice a creature: Put a +1/+1 counter on Endak City Slavedriver. Activate only as a sorcery.

Enchant land
Enchanted land has “{T}: Target creature gets -1/-1 until end of turn. Activate only as a sorcery.”