msem-instigator

At the beginning of your upkeep, if there are no noncreature cards in your graveyard, you may return target creature card from your graveyard to the battlefield.

Whenever a player gains life, that player loses 2 life.

Sunrise Prairie enters tapped.
{T}: Add {W}.
You may untap Sunrise Prairie during each other player's untap step. Whenever you do, you lose 1 life.

Target creature gets +3/+3 and gains haste until end of turn.

Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
Whenever Tegan, the Sparrowhawk attacks, you may pay {R/W}. When you do, Tegan deals 1 damage to target creature if it's tapped. Otherwise, tap it.

At the beginning of your upkeep, if you control a legendary creature, you draw a card and you lose 1 life.

Menace (This creature can't be blocked except by two or more creatures.)
Itava Warshrieker attacks each combat if able.

Lifelink
Prevent all combat damage that would be dealt to embattled creatures you control. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

{T}: Add {C}.
{1}: Risti Workshop becomes a creature in addition to its other types until end of turn.
When Risti Workshop deals combat damage to an opponent, you may sacrifice it. If you do, search your library for a basic land card, put it onto the battlefield, then shuffle.

Trample

Return each card with a cycling ability from your graveyard to your hand. You may cast any number of nonland cards with total mana value X or less from your hand without paying their mana costs, where X is the number of Satrapies you control.

Play with the top card of your library revealed.
You may play lands from the top of your library.
At the beginning of your upkeep, if you control fifteen lands with different names, you win the game.

At the beginning of your upkeep, sacrifice a non-Snake creature or Boon of the Pacts. Then create a 1/1 black Snake creature token with deathtouch.
At the beginning of your draw step, draw an additional card.
Spells you cast cost {1} less to cast.

Flying, haste
When Cataclysmic Skytyrant enters, sacrifice all other non-Dragon creatures you control. For each creature sacrificed this way, create a 3/3 red Dragon creature token with flying.

Menace
When Spaceship Invader enters, destroy target creature you don't control with mana value 3 or less.

This spell costs {1} less to cast for each artifact you control.
Gain control of target creature until end of turn. Untap that creature. It gains menace and haste until end of turn.

Spells and abilities you control that target Inconspicuous Sheep cost {1} less.
As long as Inconspicuous Sheep is enchanted or equipped, they're a 3/3 legendary Sheep Rogue named Agent S.

Shadowband Consul enters tapped.
{B}, Pay 2 life: Return Shadowband Consul from your graveyard to the battlefield. Activate only if an opponent lost life this turn.

When Ziggurat Behemoth enters, target creature gets +3/+3 until end of turn.
Cycling {2} ({2}, Discard this card: Draw a card.)

Creatures you control have “{T}: Add {C} or one mana of any of this creature's colors.”
Attain {5}{G} ({5}{G}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Spark New Life deals X damage to any target. You may put up to X land cards from your hand and/or graveyard onto the battlefield.

Whenever Single-Minded Mob becomes untapped, it gets +2/+2 until end of turn.

Flying, trample, lifelink

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.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Add one mana of any color.