msem-instigator

Solar Pulse deals 3 damage to target attacking or blocking creature.

When Solar Wisp enters the battlefield, put a +1/+1 counter on target creature.

Whenever you make first contact, return target creature card from your graveyard to the battlefield. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Flying, vigilance
Whenever one or more other creatures you control attack, those creatures get +0/+2 until end of turn.
Whenever one or more other creatures you control block, those creatures get +2/+0 until end of turn.

First strike

Destroy target artifact or enchantment. You gain 4 life.

When Soli Chronicler enters the battlefield, judge another target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Flying
Whenever Soli Windreader attacks, tap target creature without flying you don't control.

Flying
When Soli's Blessed enters the battlefield, judge another target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
{3}{W}{U}: Tap target creature and put a +1/+1 counter on Solitary Guardian.

Whenever another creature enters the battlefield under your control, target opponent loses 1 life and you gain 1 life.
Sacrifice Somber River Bearer: Creatures you control gain indestructible until end of turn.

Enchant permanent
Enchanted permanent is a land with “{T}: Add {G}{W}{U}” and loses all other card types and abilities.
{1}, Discard Song of Shoals: Add one mana of any color. Scry 1.

Enchant creature
Enchanted creature gets +1/+1 for each creature you control.

When Soul Jar enters the battlefield, exile target creature and each other creature with the same name as that creature until Soul Jar leaves the battlefield.

Whenever another creature enters the battlefield, you gain 1 life.

Flying, trample, haste
{W}{U}{B}{R}{G}: Create a token that's a copy of another target creature except it's all colors and has haste.
{W}{U}{B}{R}{G}, Exile Soul of Iscathia from your graveyard: Create a token that's a copy of target creature except it's all colors and has haste.

Soul of Misery gets +1/+1 as long as you control a Swamp.
{4}{B}: Target player discards a card. Activate only as a sorcery.

When Soul of the Sands enters the battlefield, choose one —
• You gain 4 life.
• If you gained life this turn, draw a card.

Whenever another creature enters the battlefield, you may gain 1 life.

When Soulblade enters the battlefield, exile target creature card with mana value 3 or less from your graveyard.
Whenever equipped creature attacks, create a token that's a copy of a card exiled with Soulblade that's tapped and attacking. Exile the token at end of combat.
Equip {1}

Other Spirits you control get +1/+1.
As long as a Spirit you control has flying, Soulcleaver has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

First strike, haste
Whenever Soulflare Nymph deals damage to a creature, exile that creature.

At the beginning of each end step, if you gained life this turn, put a +1/+1 counter on a creature you control.

Flying
Whenever Souls of the Jury enters the battlefield or an opponent fails a trial, create a 1/1 white Cleric creature token.