Whenever a player casts a spell from their hand, that player exiles it, then exiles cards from the top of their library until they exile a card that shares a card type with it. That player may cast that card without paying its mana cost. Then they put all cards exiled with Possibility Storm on the bottom of their library in a random order.

Flying

Pride of the Clouds gets +1/+1 for each other creature on the battlefield with flying.

Forecast — , Reveal Pride of the Clouds from your hand: Create a 1/1 white and blue Bird creature token with flying. (Activate only during your upkeep and only once each turn.)

Puncture Bolt deals 1 damage to target creature. Put a -1/-1 counter on that creature.

Storm (When you cast this spell, copy it for each spell cast before it this turn.)

Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Destroy all creatures target opponent controls. You lose 2 life for each creature destroyed this way.

Until end of turn, lands you control gain "Sacrifice this land: Add ."

Draw three cards, then discard a card.

Choose one —

• Destroy target artifact.

• Destroy target land.

Entwine (Choose both if you pay the entwine cost.)

Destroy target land.

Flying

: Rainbow Crow becomes the color of your choice until end of turn.

: Add one mana of any color. An opponent gains control of Rainbow Vale at the beginning of the next end step.

+1: Draw a card.

−2: Ral, Caller of Storms deals 3 damage divided as you choose among one, two, or three targets.

−7: Draw seven cards. Ral, Caller of Storms deals 7 damage to each creature your opponents control.

At the beginning of combat on your turn, target creature you control gets +1/+0 and gains haste until end of turn.

Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Exile target nonland permanent. For as long as that card remains exiled, its owner may cast it without paying its mana cost.

Prevent all combat damage that would be dealt this turn. You may look at each face-down creature that's attacking or blocking.

Rhystic Lightning deals 4 damage to any target unless that permanent's controller or that player pays . If they do, Rhystic Lightning deals 2 damage to the permanent or player.

Rift Bolt deals 3 damage to any target.

Suspend 1— (Rather than cast this card from your hand, you may pay and exile it with a time counter on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)

, : Counter target activated ability. Activate only if you control four or more snow permanents. (Mana abilities can't be targeted.)

Creatures named Lightning Rager can't attack you or planeswalkers you control.

At the beginning of each player's upkeep, that player creates a 5/1 red Elemental creature token named Lightning Rager. It has trample, haste, and "At the beginning of the end step, sacrifice this creature."

You may pay rather than pay the mana cost for Zombie creature spells you cast.

Sandstorm deals 1 damage to each attacking creature.

, Sacrifice Sandstorm Eidolon: Target creature can't block this turn.

Whenever you cast a multicolored spell, you may return Sandstorm Eidolon from your graveyard to your hand.

: Add .

, : Target creature can't block this turn. Activate only as a sorcery.

Whenever you cycle a card, you may pay . When you do, Savai Thundermane deals 2 damage to target creature and you gain 2 life.

Draw two cards, then discard two cards. (Then exile this card. You may cast the creature later from exile.)

Cast this spell only during the declare attackers step and only if you've been attacked this step.

Scorching Winds deals 1 damage to each attacking creature.

Sea of Clouds enters the battlefield tapped unless you have two or more opponents.

: Add or .

Enchant creature

: Tap enchanted creature.

: Untap enchanted creature.

Create a red Elemental creature token with trample and "This creature's power and toughness are each equal to the number of instant and sorcery cards in your graveyard plus the number of cards with flashback you own in exile."

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying

Whenever you cycle or discard a card, Shadowstorm Vizier gets +1/+1 until end of turn.

Whenever you cast a noncreature spell, create an X/X blue Shark creature token with flying, where X is that spell's mana value.

Cycling (, Discard this card: Draw a card.)

When you cycle Shark Typhoon, create an X/X blue Shark creature token with flying.

Flying, vigilance

When Shepherd of the Clouds enters the battlefield, return target permanent card with mana value 3 or less from your graveyard to your hand. Return that card to the battlefield instead if you control a Mount.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever you cast a noncreature spell, you may pay . If you do, target creature gains double strike until end of turn.

As long as you control a Desert or there is a Desert card in your graveyard, Sidewinder Naga gets +1/+0 and has trample.

, , Sacrifice Silver Bolt: It deals 3 damage to target creature. If a Werewolf is dealt damage this way, destroy it.

Flying

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

When you cast this spell, copy it for each time you've cast your commander from the command zone this game.

Each opponent sacrifices a creature. Each opponent who can't loses half their life, rounded up.

, , Sacrifice Skycloud Egg: Add . Draw a card.

Flying

Skywinder Drake can block only creatures with flying.

: Target creature you control gains flying until end of turn.

: Prevent all combat damage that would be dealt to and dealt by target creature you control this turn.

Flying

, Return a land you control to its owner's hand: Target creature you control gains shroud until end of turn. (It can't be the target of spells or abilities.)

Whenever Soul of Windgrace enters the battlefield or attacks, you may put a land card from a graveyard onto the battlefield tapped under your control.

, Discard a land card: You gain 3 life.

, Discard a land card: Draw a card.

, Discard a land card: Soul of Windgrace gains indestructible until end of turn. Tap it.

Counter target spell. Create X Treasure tokens, where X is that spell's mana value. (They're artifacts with ", Sacrifice this artifact: Add one mana of any color.")

Flying

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Spire Winder gets +1/+1 as long as you have the city's blessing.

Tap all blocking creatures. Prevent all combat damage that would be dealt this turn. Each attacking creature and each blocking creature doesn't untap during its controller's next untap step.

Flying

, : Tap target creature.

: Squallmonger deals 1 damage to each creature with flying and each player. Any player may activate this ability.

Destroy target land.

When Storm Caller enters the battlefield, it deals 2 damage to each opponent.

Flying (This creature can't be blocked except by creatures with flying or reach.)