msem-instigator

Until end of turn, target creature gets +1/+1 and gains lifelink.

Regenerate target creature. (The next time this would be destroyed this turn, it isn't. Instead tap it.)

When Suspect Concoctions enters the battlefield, put a +1/+1 counter on target creature.
{4}, Sacrifice Suspect Concoctions: Put two +1/+1 counters on target creature.

Flying
At the beginning of your upkeep, you may pay {1}. If you do, put a +1/+1 counter on Swarm of the Dispossessed.
Sacrifice Swarm of the Dispossessed: Counter target spell with mana value X, where X is the number of +1/+1 counters on Swarm of the Dispossessed.

Swarming Midden enters the battlefield tapped unless you control a basic Swamp.
{T}: Add {B}.
{1}{B}{B}: Swarming Midden becomes a 2/3 black Rat creature with menace until end of turn. It's still a land. Whenever it attacks this turn, create a 1/1 black Rat creature token with “This creature can't block.”

{T}: Add {C}.
{T}, Pay 1 life: Add {W}.
{5}{W}, {T}, Sacrifice Swaying Sands: Create three 1/1 white Bird creature tokens with flying. Activate only as a sorcery.

Swiftwater Cliffs enters the battlefield tapped.
When Swiftwater Cliffs enters the battlefield, you gain 1 life.
{T}: Add {U} or {R}.

Target player reveals their hand. Exile a nonland card from it and put a secret counter on it. As long as that card remains exiled, that player may pay {2} any time they could cast a sorcery to put it into their hand.
{X}{B}{B}, Exile Swipe Secrets from your graveyard: Until end of turn, you may cast target card you exiled with a secret counter on it and mana value X without paying its mana cost.

Sword deals 2 damage to any target.
Fuse (You may cast one or both halves of this card from your hand.)

Sycophantic Aristocrat gets +2/+1 as long as you control another Noble.

When Sylvan Explorer enters the battlefield, reveal the top card of your library. If it's a land card, put it onto the battlefield tapped.

Reach
Whenever another creature enters, untap Sylvan Subversive.

Whenever you cast a blue spell, each opponent mills a card.

Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Syndicate Sycophant can't block.
When a creature scavenges Syndicate Sycophant, you may search your library for a card named Syndicate Sycophant, reveal it, put it into your hand, then shuffle.
Scavenge {2}{B} ({2}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

{T}, Sacrifice Synthetic Seedling: Choose a basic land type. Create a tapped colorless enchantment land token with the chosen type.

At the beginning of each player's upkeep, put a darkness counter on target nonland permanent they control. That permanent is black for as long as it has a darkness counter on it. Then if there are five or more nonland permanents on the battlefield and they are all black, you may exile Tahiel, Elder Kalku and gain control of target creature or planeswalker.

Taifeng Shrine enters the battlefield tapped.
{T}: Add {W} or {U}.
{W/U}, {T}, Sacrifice Taifeng Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Enchant creature
Enchanted creature gets +1/+0 and has trample and reach.

Draw three cards.
Skip your next turn. If it's your turn, end the turn.

Target creature gets +1/+2 and gains flying until end of turn.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Whenever you scry, Taker of Tithes gets +1/+0 until end of turn and can't be blocked this turn.

Creatures you control with flying get +1/+1.
At the beginning of combat on your turn, target creature you control soars. (Put a flying counter on it. If it already has flying, put a +1/+1 counter on it instead.)

Takumi's Headquarters enters the battlefield tapped.
When Takumi's Headquarters enters the battlefield, you may mill two cards.
{T}: Add {W} or {U}.