msem-instigator

Temple Recluse gets +1/+0 as long as you've cast a noncreature spell this turn.

Counter target spell.

As Sunless Ridge enters, you may tap an untapped creature you control. If you don't, Sunless Ridge enters tapped.
{T}: Add {B} or {R}.

Whenever three or more creatures you control attack, you may attach Cyrukan Battleaxe to target attacking creature.
Equipped creature gets +1/+0 and has double strike.
Equip {4}

Exile target tapped creature. Its controller gains 3 life.

Whenever you cast a spell, if it shared a color with the last spell you cast this turn, put two +1/+1 counters on Defected Android.

Punish Aggression deals 4 damage to target attacking or blocking creature.

Menace
Whenever an opponent casts a spell during your turn or an opponent casts a spell that targets a creature you control, amass Soldiers 1. (Put a +1/+1 counter on an Army you control. It's also a Soldier. If you don't control one, create an 0/0 black Soldier Army creature token first.)

Enchant creature
Enchanted creature gets +2/+2.
When Seeking Horizons is put into your graveyard from anywhere other than your library, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Trample
{2}{G}{U}: Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.

Deathtouch
Engorge (As this enters, mill three cards, then exile a card from among the milled cards.)
When Deadland Scavenger dies, you may put the card it engorged into your hand if it's a creature or land card.

Create X 1/1 white Soldier creature tokens, where X is the number of creatures you don't control.

({T}: Add {W} or {B}.)
As Ruptured Expanse enters, you may pay {1}. If you don't, Ruptured Expanse enters tapped.

Choose one or both —
• You gain 5 life.
• Each player draws three cards.

{T}: Add {C}.
{4}, {T}, Sacrifice Eon Campfire: Destroy target artifact or nonbasic land.

Remove all counters from target creature. You gain 1 life for each counter removed this way.

Audition for green, then audition for green. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Warrior Role giving 3/2 and trample. Roles replace older ones.)

Whenever you cast an instant or sorcery spell, put a loyalty counter on Reytali of Endless Muses.
[0]: Add X mana in any combination of colors, where X is the number of spells you've cast this turn.
[–3]: Create two 3/1 red Sand creature tokens with haste.

Desert Storm deals 6 damage to target creature.

Whenever Murkriver Trawler attacks, until end of turn, target Rogue gains “Whenever this creature deals combat damage to a player, draw a card.”

Flying
Morph {1}{U} (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 Ishim of the Mists is turned face up, turn all other face-up creature you control face down.

Creatures you control get +2/+2 and gain trample until end of turn. If you cast this spell from exile, creatures you control get an additional +2/+2 until end of turn.
Prophecy {2}{G}{G} (Once each turn, you may exile a card with prophecy as you reveal it. When you do, you may cast it for its prophecy cost as long as it's exiled.)

Vigilance
{1}{W}: Barbarian Axe Flinger gains double strike until end of turn.

Flying
Whenever Herald of Flame attacks, gain control of target permanent until end of combat. If it's a creature, you may have it become tapped and attacking.
Whenever a creature you control becomes blocked, Herald of Flame deals 3 damage to the player or planeswalker that creature is attacking.

Choose one—
• Destroy target artifact.
• Target creature gets +4/+4 until end of turn.