Return all attacking creatures to their owner's hand.

Flying

Whenever Archon of the Triumvirate attacks, detain up to two target nonland permanents your opponents control. (Until your next turn, those permanents can't attack or block and their activated abilities can't be activated.)

Artifact and enchantment spells your opponents cast cost {2} more to cast.

Sacrifice Aura of Silence: Destroy target artifact or enchantment.

Flying

When Azor, the Lawbringer enters the battlefield, each opponent can't cast instant or sorcery spells during that player's next turn.

Whenever Azor attacks, you may pay {X}{W}{U}{U}. If you do, you gain X life and draw X cards.

When Azorius Arrester enters the battlefield, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

Azorius Guildgate enters the battlefield tapped.

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

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

Vigilance

Creatures can't attack you or planeswalkers you control unless their controller pays {1} for each of those creatures.

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

Whenever Blinding Angel deals combat damage to a player, that player skips their next combat phase.

Flying

When Cavalier of Gales enters the battlefield, draw three cards, then put two cards from your hand on top of your library in any order.

When Cavalier of Gales dies, shuffle it into its owner's library, then scry 2.

Flying

When Cloudblazer enters the battlefield, you gain 2 life and draw two cards.

Target creature gets -4/-0 until end of turn.

Draw a card.

Addendum -- If you cast this spell during your main phase, tap that creature and it doesn't untap during its controller's next untap step.

{T}: Add one mana of any color in your commander's color identity.

Counter target spell.

Destroy target artifact or enchantment.

When Dovin's Acuity enters the battlefield, you gain 2 life and draw a card.

Whenever you cast an instant spell during your main phase, you may return Dovin's Acuity to its owner's hand.

As long as you control a Dovin planeswalker, Dovin's Automaton gets +2/+2 and has vigilance. (Attacking doesn't cause it to tap.)

This spell can't be countered.

Counter target noncreature spell.

+1: You gain 2 life and draw a card.

-1: Tap target creature. It doesn't untap during its controller's next untap step.

-9: Tap all permanents target opponent controls. That player skips their next untap step.

Artifact, instant, and sorcery spells your opponents cast cost {1} more to cast.

-1: Until your next turn, prevent all damage that would be dealt to and dealt by target permanent an opponent controls.

Flying, lifelink

Whenever you draw a card, Dream Trawler gets +1/+0 until end of turn.

Whenever Dream Trawler attacks, draw a card.

Discard a card: Dream Trawler gains hexproof until end of turn. Tap it.

{1}{U}, {T}: Tap target creature.

Flying

When Elite Guardmage enters the battlefield, you gain 3 life and draw a card.

When Gadwick, the Wizened enters the battlefield, draw X cards.

Whenever you cast a blue spell, tap target nonland permanent an opponent controls.

Glacial Fortress enters the battlefield tapped unless you control a Plains or an Island.

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

Target creature you control gains protection from the color of your choice until end of turn. (It can't be blocked, targeted, dealt damage, enchanted, or equipped by anything of that color.)

Scry 1.

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

Irrigated Farmland enters the battlefield tapped.

Cycling {2} ({2}, Discard this card: Draw a card.)

If you would draw a card while your library has no cards in it, you win the game instead.

+1: Target player mills two cards. Draw a card.

-8: Draw seven cards. Then if your library has no cards in it, you win the game.

Spells your opponents cast that target a creature or planeswalker you control cost {2} more to cast.

-2: Create a 2/2 blue Wizard creature token. Draw a card, then discard a card.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I -- Create an 8/8 blue Kraken creature token with hexproof.

II -- Tap all nonland permanents target opponent controls. They don't untap during their controller's next untap step.

III -- Gain control of target permanent an opponent controls. Untap it.

At the beginning of your upkeep, if an opponent controls more lands than you, you may search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle.

Protection from red

When Lavinia of the Tenth enters the battlefield, detain each nonland permanent your opponents control with mana value 4 or less. (Until your next turn, those permanents can't attack or block and their activated abilities can't be activated.)

{1}, {T}: Tap target creature with mana value 2 or greater.

Meandering River enters the battlefield tapped.

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

Flying

Whenever Medomai the Ageless deals combat damage to a player, take an extra turn after this one.

Medomai the Ageless can't attack during extra turns.

Copy target instant or sorcery spell, then return it to its owner's hand. You may choose new targets for the copy.

Counter target noncreature spell.

({W/P} can be paid with either {W} or 2 life.)

Creatures can't attack you or planeswalkers you control unless their controller pays {W/P} for each of those creatures.

Flash

When Omen of the Sea enters the battlefield, scry 2, then draw a card.

{2}{U}, Sacrifice Omen of the Sea: Scry 2.

Flash

When Omen of the Sun enters the battlefield, create two 1/1 white Human Soldier creature tokens and you gain 2 life.

{2}{W}, Sacrifice Omen of the Sun: Scry 2.

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

Prairie Stream enters the battlefield tapped unless you control two or more basic lands.

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

You have no maximum hand size.

{T}: Add {C}.

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

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

Seachrome Coast enters the battlefield tapped unless you control two or fewer other lands.

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

Sejiri Refuge enters the battlefield tapped.

When Sejiri Refuge enters the battlefield, you gain 1 life.

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

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

{U}, {T}: Draw a card, then discard a card.

Tap up to two target creatures.

Spell mastery -- If there are two or more instant and/or sorcery cards in your graveyard, those creatures don't untap during their controllers' next untap steps.

When Skyclave Apparition enters the battlefield, exile up to one target nonland, nontoken permanent you don't control with mana value 4 or less.

When Skyclave Apparition leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card.

When Somnomancer enters the battlefield, you may tap target creature.

Enchant creature (Target a creature as you cast this. This card enters the battlefield attached to that creature.)

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

Summary Judgment deals 3 damage to target tapped creature.

Addendum -- If you cast this spell during your main phase, it deals 5 damage instead.

Temple of Enlightenment enters the battlefield tapped.

When Temple of Enlightenment enters the battlefield, scry 1.

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

Tranquil Cove enters the battlefield tapped.

When Tranquil Cove enters the battlefield, you gain 1 life.

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

Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card.

{4}{U}: Tap target creature without flying.

Flying

Creature spells with flying you cast cost {1} less to cast.

Whenever another creature with flying enters the battlefield under your control, Watcher of the Spheres gets +1/+1 until end of turn.

Companion -- Your starting deck contains at least twenty cards more than the minimum deck size. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.)

Flying

When Yorion enters the battlefield, exile any number of other nonland permanents you own and control. Return those cards to the battlefield at the beginning of the next end step.