Cloud Elemental

Flying
This creature can block only creatures with flying.

Cloud Dragon

Cloudcrest Lake

{T}: Add {C}.
{T}: Add {W} or {U}. This land doesn't untap during your next untap step.

Aven Cloudchaser

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, destroy target enchantment.

Cloud Spirit

Skycloud Egg

{2}, {T}, Sacrifice this artifact: Add {W}{U}. Draw a card.

Cloud Crusader

Flying
First strike (This creature deals combat damage before creatures without first strike.)

Lifted by Clouds

Target creature gains flying until end of turn.
Splice onto Arcane {1}{U} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Cloud Djinn

Cloud Cover

Whenever another permanent you control becomes the target of a spell or ability an opponent controls, you may return that permanent to its owner's hand.

Cloudreader Sphinx

Flying
When this creature enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)

Cloudsteel Kirin

Flying
Equipped creature has flying and "You can't lose the game and your opponents can't win the game."
Reconfigure {5} ({5}: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Skycloud Expanse

Cloudchaser Kestrel

Flying
When this creature enters, destroy target enchantment.
{W}: Target permanent becomes white until end of turn.

Soratami Cloud Chariot

{2}: Target creature you control gains flying until end of turn.
{2}: Prevent all combat damage that would be dealt to and dealt by target creature you control this turn.

Cloudreach Cavalry

As long as you control a Bird, this creature gets +2/+2 and has flying.

Cloud Key

As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost {1} less to cast.

Cloudkin Seer

Flying
When this creature enters, draw a card.

Soratami Cloudskater

Flying
{2}, Return a land you control to its owner's hand: Draw a card, then discard a card.

Cloudblazer

Flying
When this creature enters, you gain 2 life and draw two cards.

Cloudchaser Eagle

Flying
When this creature enters, destroy target enchantment.

Pride of the Clouds

Flying
This creature gets +1/+1 for each other creature on the battlefield with flying.
Forecast — {2}{W}{U}, Reveal this creature 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.)

Stormcloud Spirit

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

Sea of Clouds

This land enters tapped unless you have two or more opponents.
{T}: Add {W} or {U}.

Cloudshift

Exile target creature you control, then return that card to the battlefield under your control.

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.

Cloudform

When this enchantment enters, it becomes an Aura with enchant creature. Manifest the top card of your library and attach this enchantment to it. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)
Enchanted creature has flying and hexproof.