True Believer

You have shroud. (You can't be the target of spells or abilities.)

Gridlock

Serve

Target creature gets -6/-0 until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Protect

Target creature gets +2/+4 until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Protect // Serve

Minister of Impediments

({W/U} can be paid with either {W} or {U}.)
{T}: Tap target creature.

Warden of Evos Isle

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

Merchant Scroll

Search your library for a blue instant card, reveal that card, put it into your hand, then shuffle.

Spellbook

Spirit Link

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Whenever enchanted creature deals damage, you gain that much life.

Angel of Glory's Rise

Flying
When this creature enters, exile all Zombies, then return all Human creature cards from your graveyard to the battlefield.

Secluded Steppe

This land enters tapped.
{T}: Add {W}.
Cycling {W} ({W}, Discard this card: Draw a card.)

Lonely Sandbar

This land enters tapped.
{T}: Add {U}.
Cycling {U} ({U}, Discard this card: Draw a card.)

Sigarda's Summons

Creatures you control with +1/+1 counters on them have base power and toughness 4/4, have flying, and are Angels in addition to their other types.

Transguild Promenade

This land enters tapped.
When this land enters, sacrifice it unless you pay {1}.
{T}: Add one mana of any color.

Lyev Skyknight

Flying
When this creature enters, detain target nonland permanent an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)

Aether Barrier

Whenever a player casts a creature spell, that player sacrifices a permanent of their choice unless they pay {1}.

Donal, Herald of Wings

Whenever you cast a nonlegendary creature spell with flying, you may copy it, except the copy is a 1/1 Spirit in addition to its other types. Do this only once each turn. (The copy becomes a token.)

Starlit Sanctum

{T}: Add {C}.
{W}, {T}, Sacrifice a Cleric creature: You gain life equal to the sacrificed creature's toughness.
{B}, {T}, Sacrifice a Cleric creature: Target player loses life equal to the sacrificed creature's power.

Spell Rupture

Counter target spell unless its controller pays {X}, where X is the greatest power among creatures you control.

Martyr of Sands

{1}, Reveal X white cards from your hand, Sacrifice this creature: You gain three times X life.

Tower Drake

Flying
{W}: This creature gets +0/+1 until end of turn.

Soul's Attendant

Whenever another creature enters, you may gain 1 life.

Aetherize

Return all attacking creatures to their owner's hand.

Glasses of Urza

Sea's Claim

Enchant land (Target a land as you cast this. This card enters attached to that land.)
Enchanted land is an Island.

Seacoast Drake

Azorius Guildgate

This land enters tapped.
{T}: Add {W} or {U}.

Serra Angel

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Mortal Obstinacy

Enchant creature you control
Enchanted creature gets +1/+1.
Whenever enchanted creature deals combat damage to a player, you may sacrifice this Aura. If you do, destroy target enchantment.

Ollenbock Escort

Vigilance
Sacrifice this creature: Target creature you control with a +1/+1 counter on it gains lifelink and indestructible until end of turn.

Skyline Predator

Flash (You may cast this spell any time you could cast an instant.)
Flying

Feldon's Cane

{T}, Exile this artifact: Shuffle your graveyard into your library.

Hall of Triumph

As Hall of Triumph enters, choose a color.
Creatures you control of the chosen color get +1/+1.

Aerial Formation

Strive — This spell costs {2}{U} more to cast for each target beyond the first.
Any number of target creatures each get +1/+1 and gain flying until end of turn.

Cloudfin Raptor

Flying
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)