msem-instigator

Skulking Claw can't be blocked by creatures with greater power.
Skulking Claw gets +1/+0 for each unblocked attacking creature you control.

{T}: Add {C}. Spend this mana only to cast an instant or sorcery spell or activate an ability.
{2}{U}: Move a counter from target creature onto another target creature.

Trample
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

First strike
Each other nontoken creature you control enters with an additional +1/+1 counter on it.

Haste
At the beginning of each end step, if Lightning Ox dealt damage this turn, sacrifice it.

Each opponent sacrifices a creature. For each creature sacrificed this way, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

Majestic Nauticorn has first strike as long as it's attacking.
Cycling {W} ({W}, Discard this card: Draw a card.)

Alpha (You may have this creature enter with a +1/+1 counter on it. If you do, it becomes alpha and can only attack alone.)
Vigilance, reach, trample
{4}{G}{G}, Exile Qiyan, Serpent of Seven Heads from your graveyard: Create seven 1/1 green Snake creature tokens. Activate only as a sorcery.

Menace, lifelink
Whenever a creature enters under an opponent's control, you may have that player lose 1 life.

Cosmic Coalescing deals X damage to any target. You may reveal a noncreature card with mana value X or less you own from outside the game and put it into your hand. X can't be 0.
Exile Cosmic Coalescing.

If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead, except the additional tokens are named Ingenious Idea.
At the beginning of your end step, exile each token you control named Ingenious Idea.

Gain control of target creature until end of turn. Untap it. Until end of turn, it gains haste and “This creature can't be blocked.”
{1}, Discard Cruel Heartbeat: Add one mana of any color. Scry 1.

The Pillaging of Kaneh deals X damage to each creature and each planeswalker, where X is the number of Satrapies you control.

When Carrion Scythe enters, if you cast it, you may return target creature card from your graveyard to the battlefield, then attach Carrion Scythe to it.
Equipped creature gets +1/+1 and has deathtouch.
Equip {2}

Heroic — Whenever you cast a spell that targets Pheres-Band Courser, put a +1/+1 counter on Pheres-Band Courser.

({T}: Add {G}.)
As Flourishing Dunes enters, you may pay 1 life. If you don't, Flourishing Dunes enters tapped.

Lifelink
When Herald of Royalty enters, creatures you control get +1/+1 and gain vigilance until end of turn.

Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)
Flashback—{B}, Pay 2 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Frondpond Grotto enters tapped unless you played it from exile.
{T}: Add {U} or {B}.

{T}: Add one mana of any color. If you spend this mana to cast a face-down creature spell, you gain 2 life.

Investigate, then counter target spell unless its controller pays {1} for each Clue you control. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

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.

Whenever Wakeborne Kraken or another Kraken, Leviathan, Octopus, or Serpent you control enters, you may return target creature an opponent controls to its owner's hand.
Whenever a creature an opponent controls leaves the battlefield, if it didn't die, draw a card.

Choose X. You may choose the same mode more than once.
• Epic of Anku deals 4 damage to each creature.
• You draw three cards and you lose 3 life.
• Return target nonplaneswalker permanent card from your graveyard to the battlefield.

Horizon Wayfarer's power and toughness are each equal to the number of differently named lands you control.