Sire of the Storm

Flying
Whenever you cast a Spirit or Arcane spell, you may draw a card.

Kodama of the South Tree

Whenever you cast a Spirit or Arcane spell, each other creature you control gets +1/+1 and gains trample until end of turn.

Cloudhoof Kirin

Flying
Whenever you cast a Spirit or Arcane spell, you may have target player mill X cards, where X is that spell's mana value.

Innocence Kami

{W}, {T}: Tap target creature.
Whenever you cast a Spirit or Arcane spell, untap this creature.

Kykar, Wind's Fury

Flying
Whenever you cast a noncreature spell, create a 1/1 white Spirit creature token with flying.
Sacrifice a Spirit: Add {R}.

Baku Altar

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this artifact.
{2}, {T}, Remove a ki counter from this artifact: Create a 1/1 colorless Spirit creature token.

Dreamcatcher

Whenever you cast a Spirit or Arcane spell, you may sacrifice this creature. If you do, draw a card.

Kyoki, Sanity's Eclipse

Whenever you cast a Spirit or Arcane spell, target opponent exiles a card from their hand.

Kiri-Onna

When this creature enters, return target creature to its owner's hand.
Whenever you cast a Spirit or Arcane spell, you may return this creature to its owner's hand.

Azamuki, Treachery Incarnate

Remove a ki counter from Azamuki: Gain control of target creature until end of turn.

Cunning Bandit

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature.
At the beginning of the end step, if there are two or more ki counters on this creature, you may flip it.

Cunning Bandit // Azamuki, Treachery Incarnate

Kami of Fire's Roar

Whenever you cast a Spirit or Arcane spell, target creature can't block this turn.

Nikko-Onna

When this creature enters, destroy target enchantment.
Whenever you cast a Spirit or Arcane spell, you may return this creature to its owner's hand.

Vial Smasher the Fierce

Whenever you cast your first spell each turn, choose an opponent at random. Vial Smasher deals damage equal to that spell's mana value to that player or a planeswalker that player controls.
Partner (You can have two commanders if both have partner.)

Soul of Magma

Whenever you cast a Spirit or Arcane spell, this creature deals 1 damage to target creature.

Tallowisp

Whenever you cast a Spirit or Arcane spell, you may search your library for an Aura card with enchant creature, reveal it, put it into your hand, then shuffle.

Yuki-Onna

When this creature enters, destroy target artifact.
Whenever you cast a Spirit or Arcane spell, you may return this creature to its owner's hand.

Scarmaker

Remove a ki counter from Scarmaker: Target creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

Hired Muscle

Hired Muscle // Scarmaker

Kami of the Hunt

Whenever you cast a Spirit or Arcane spell, this creature gets +1/+1 until end of turn.

Zevlor, Elturel Exile

Haste
{2}, {T}: When you next cast an instant or sorcery spell that targets only a single opponent or a single permanent an opponent controls this turn, for each other opponent, choose that player or a permanent they control, copy that spell, and the copy targets the chosen player or permanent.

Ore Gorger

Whenever you cast a Spirit or Arcane spell, you may destroy target nonbasic land.

Petalmane Baku

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature.
{1}, Remove X ki counters from this creature: Add X mana of any one color.

Guardian of Solitude

Whenever you cast a Spirit or Arcane spell, target creature gains flying until end of turn.

Celestial Kirin

Flying
Whenever you cast a Spirit or Arcane spell, destroy all permanents with that spell's mana value.

Teller of Tales

Flying
Whenever you cast a Spirit or Arcane spell, you may tap or untap target creature.

Jaraku the Interloper

Remove a ki counter from Jaraku: Counter target spell unless its controller pays {2}.

Callow Jushi

Callow Jushi // Jaraku the Interloper

Briarknit Kami

Whenever you cast a Spirit or Arcane spell, put a +1/+1 counter on target creature.

Oyobi, Who Split the Heavens

Flying
Whenever you cast a Spirit or Arcane spell, create a 3/3 white Spirit creature token with flying.

Kami of the Waning Moon

Flying
Whenever you cast a Spirit or Arcane spell, target creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

Bounteous Kirin

Flying
Whenever you cast a Spirit or Arcane spell, you may gain life equal to that spell's mana value.

Infernal Kirin

Flying
Whenever you cast a Spirit or Arcane spell, target player reveals their hand and discards all cards with that spell's mana value.

Blademane Baku

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature.
{1}, Remove X ki counters from this creature: For each counter removed, this creature gets +2/+0 until end of turn.

Hinata, Dawn-Crowned

Flying, trample
Spells you cast cost {1} less to cast for each target.
Spells your opponents cast cost {1} more to cast for each target.

Skyfire Kirin

Flying
Whenever you cast a Spirit or Arcane spell, you may gain control of target creature with that spell's mana value until end of turn.

Thief of Hope

Whenever you cast a Spirit or Arcane spell, target opponent loses 1 life and you gain 1 life.
Soulshift 2 (When this creature dies, you may return target Spirit card with mana value 2 or less from your graveyard to your hand.)

Waxmane Baku

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature.
{1}, Remove X ki counters from this creature: Tap X target creatures.

The Prismatic Bridge

At the beginning of your upkeep, reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.

Esika, God of the Tree

Vigilance
{T}: Add one mana of any color.
Other legendary creatures you control have vigilance and "{T}: Add one mana of any color."

Esika, God of the Tree // The Prismatic Bridge

Loam Dweller

Whenever you cast a Spirit or Arcane spell, you may put a land card from your hand onto the battlefield tapped.

Skullmane Baku

Whenever you cast a Spirit or Arcane spell, you may put a ki counter on this creature.
{1}, {T}, Remove X ki counters from this creature: Target creature gets -X/-X until end of turn.

Elder Pine of Jukai

Whenever you cast a Spirit or Arcane spell, reveal the top three cards of your library. Put all land cards revealed this way into your hand and the rest on the bottom of your library in any order.
Soulshift 2 (When this creature dies, you may return target Spirit card with mana value 2 or less from your graveyard to your hand.)

Kaiso, Memory of Loyalty

Flying
Remove a ki counter from Kaiso: Prevent all damage that would be dealt to target creature this turn.