msem-instigator

This spell can't be countered.
Piercing Arrow deals 4 damage to any target.

Deathtouch
At the beginning of your end step, if you control no Sharks, create a 1/1 blue and black Demon Shark creature token with “This creature can't block” and “When this creature deals combat damage to a player, sacrifice it. If you do, draw a card.”

Flash (You may cast this spell any time you could cast an instant.)
When Gorillas in the Mist enters, prevent all combat damage that other creatures would deal this turn.

Reverberate {3} (When you cast this spell, copy it if you paid its reverberate cost. You may choose new targets for the copy.)
Target creature can't block this turn.
Target creature can't be blocked this turn.

When Establish Guard enters or leaves the battlefield, create a 1/1 white Human Soldier creature token and you gain 1 life.

Sacrifice a creature: Put a +1/+1 counter on Masked Assailant. It gains menace until end of turn. Activate only as a sorcery.

When Deadly Harpoon enters, destroy up to one target creature or planeswalker.
Equipped creature gets +2/+0.
Equip {2}

You gain 1 life. Scry 1. Draw a card.

Your opponents can't cast spells or activate abilities that aren't mana abilities this turn.

Whenever another creature you control enters, you gain 1 life.
{4}{W}: Return another target creature you control to its owner's hand.

Other artifacts you control have ward {1}.
Overcast — Whenever you cast an artifact creature spell, if {C} was spent to cast it, it enters with an additional +1/+1 counter on it.

[+1]: Emperor Tzhai deals 1 damage to each creature, planeswalker, and opponent you don't control.
[0]: Target creature can't attack you or Emperor Tzhai until Emperor Tzhai leaves the battlefield.
[–10]: You control target player.

Destroy target artifact or nonbasic land.

Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)
When Sower of Wishes enters, reveal the top three cards of your library. Put all land cards revealed this way into your hand and the rest back on top in any order.

You may cast this spell by paying {1}{W}{U}{B}{R}{G} rather than paying its mana cost.
Defender, indestructible
Lands you control are 2/2 Spirit creatures with haste and indestructible.

Menace
When Zygos's Decimators enters, put a number of +1/+1 counters on it equal to your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Haste
Sacrifice a creature or discard a card or reappropriate or pay 2 life: Makias, Marked Marauder gets +1/+0 until end of turn. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)

Create a 4/4 red Dragon creature token with flying.
Showcase {5}{U}{R} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

At the beginning of your end step, mill two cards. Then if ten or more cards are in your graveyard, transform Bitter Duckling.

Discard your hand. Draw a card for each artifact you control, then add {U} for each artifact you control. Exile Taste Brilliance.

Target opponent mills five cards, then you exile up to two instant and/or sorcery cards from that player's graveyard. You may cast those cards for as long as they remain exiled, and you may spend mana as though it were mana of any type to cast them.

Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.)
Create a 5/5 colorless Scarecrow artifact creature token with “This creature can't block or harvest.”
Flashback {8}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

When Azure Archaeologist enters, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
{2}, {T}, Sacrifice a Clue: Draw two cards, then discard a card.

{T}: Add {C}.
{T}, Sacrifice Untethered Spire: Choose target land card in your graveyard that was put there from the battlefield this turn. Return that card to your hand.

When Baneblade Stalker enters, proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)