White blue spirits

Whenever another nontoken creature enters the battlefield under your control, bolster 1. (Choose a creature with the least toughness among creatures you control and put a +1/+1 counter on it.)

{T}: Draw three cards.

{2}{U}{U}: Return Arcanis the Omnipotent to its owner's hand.

Flying

As long as Archangel of Tithes is untapped, creatures can't attack you or planeswalkers you control unless their controller pays {1} for each of those creatures.

As long as Archangel of Tithes is attacking, creatures can't block unless their controller pays {1} for each of those creatures.

Azorius Chancery enters the battlefield tapped.

When Azorius Chancery enters the battlefield, return a land you control to its owner's hand.

{T}: Add {W}{U}.

Azorius Guildgate enters the battlefield tapped.

{T}: Add {W} or {U}.

Azorius Herald can't be blocked.

When Azorius Herald enters the battlefield, you gain 4 life.

When Azorius Herald enters the battlefield, sacrifice it unless {U} was spent to cast it.

Flying

Whenever you cast an enchantment spell, put a +1/+1 counter on Blessed Spirits.

{0}: Return Blinking Spirit to its owner's hand.

Boreal Shelf enters the battlefield tapped.

{T}: Add {W} or {U}.

Flying

Whenever Brago, King Eternal deals combat damage to a player, exile any number of target nonland permanents you control, then return those cards to the battlefield under their owner's control.

Flying

Whenever you cast a creature spell with mana value 3 or less, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.")

Flash

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)

Flying

Other white creatures get +1/+1.

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.

Coastal Tower enters the battlefield tapped.

{T}: Add {W} or {U}.

Custodi Soulbinders enters the battlefield with X +1/+1 counters on it, where X is the number of other creatures on the battlefield.

{2}{W}, Remove a +1/+1 counter from Custodi Soulbinders: Create a 1/1 white Spirit creature token with flying.

Flying

Other Spirit creatures you control get +1/+1 and have hexproof. (They can't be the targets of spells or abilities your opponents control.)

Flying

Whenever another Spirit enters the battlefield under your control, you gain 2 life.

{3}{W}: Create a 1/1 white Spirit creature token with flying.

Flying, double strike, lifelink

Whenever you gain life, draw a card.

Bestow {2}{W}{W} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)

Eidolon of Countless Battles and enchanted creature each get +1/+1 for each creature you control and +1/+1 for each Aura you control.

Flying

{3}{W}: Exile Flickering Spirit, then return it to the battlefield under its owner's control.

Defender

At the beginning of your upkeep, scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Vigilance

Geist-Honored Monk's power and toughness are each equal to the number of creatures you control.

When Geist-Honored Monk enters the battlefield, create two 1/1 white Spirit creature tokens with flying.

Flying

{U}{U}{U}: Regenerate Ghost Ship.

{W}, {T}: You gain 2 life.

Channel — {1}{W}, Discard Ghost-Lit Redeemer: You gain 4 life.

Vigilance

When Hallowed Spiritkeeper dies, create X 1/1 white Spirit creature tokens with flying, where X is the number of creature cards in your graveyard.

Flying, first strike

Soulshift 5 (When this creature dies, you may return target Spirit card with mana value 5 or less from your graveyard to your hand.)

Flying

When Keiga, the Tide Star dies, gain control of target creature.

Destroy all creatures. They can't be regenerated.

Threshold — If seven or more cards are in your graveyard, instead destroy all creatures, then create two 1/1 white Spirit creature tokens with flying. Creatures destroyed this way can't be regenerated.

Flying

{U}: Return Lantern Spirit to its owner's hand.

Flying

At the beginning of your upkeep, you may create a 1/1 white Spirit creature token with flying.

When Mausoleum Guard dies, create two 1/1 white Spirit creature tokens with flying.

Create two 1/1 white Spirit creature tokens with flying.

When Nikko-Onna enters the battlefield, destroy target enchantment.

Whenever you cast a Spirit or Arcane spell, you may return Nikko-Onna to its owner's hand.

Put target card from a graveyard on the top or bottom of its owner's library. Create a 1/1 white Spirit creature token with flying.

Flying

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

Creature tokens you control get +1/+1.

When a creature you control dies, sacrifice Promise of Bunrei. If you do, create four 1/1 colorless Spirit creature tokens.

Flying

Sacrifice Remorseful Cleric: Exile target player's graveyard.

{W}: Regenerate Revered Dead.

Flying

Flying, first strike

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Whenever a creature you control attacks alone, you may search your library for an Aura card that could enchant that creature, put it onto the battlefield attached to that creature, then shuffle.

Create three 1/1 white Spirit creature tokens with flying.

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Flying

{1}{U}: Return target Spirit you control to its owner's hand.

Whenever a nontoken creature enters the battlefield under your control, you may pay {W}. If you do, create a 1/1 white Spirit creature token with flying.

{1}{W}, Sacrifice a Spirit: Target non-Spirit creature gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Shadow (This creature can block or be blocked by only creatures with shadow.)

Forecast — {1}{W}, Reveal Spirit en-Dal from your hand: Target creature gains shadow until end of turn. (Activate only during your upkeep and only once each turn.)

Enchant creature you control

Whenever enchanted creature deals damage, you gain that much life.

When Spirit Loop is put into a graveyard from the battlefield, return Spirit Loop to its owner's hand.

Creatures and lands you control have shroud. (They can't be the targets of spells or abilities.)

When a creature you control attacks, sacrifice Spiritual Asylum.

Flying

Other Spirits you control get +1/+1.

Cumulative upkeep {1}{W} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

Damage that would reduce your life total to less than 1 reduces it to 1 instead.

Flying

{W/B}{W/B}{W/B}: Regenerate target creature.

Flying, trample

Whenever The Unspeakable deals combat damage to a player, you may return target Arcane card from your graveyard to your hand.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Create three 1/1 white Spirit creature tokens with flying. (They can't be blocked except by creatures with flying or reach.)

Whenever a creature token leaves the battlefield, put a +1/+1 counter on Twilight Drover.

{2}{W}, Remove a +1/+1 counter from Twilight Drover: Create two 1/1 white Spirit creature tokens with flying.

Ursine Fylgja enters the battlefield with four healing counters on it.

Remove a healing counter from Ursine Fylgja: Prevent the next 1 damage that would be dealt to Ursine Fylgja this turn.

{2}{W}: Put a healing counter on Ursine Fylgja.

Defender, flying

At the beginning of your end step, you may gain life equal to the power of target creature you control.

Flying

When Yosei, the Morning Star dies, target player skips their next untap step. Tap up to five target permanents that player controls.