Wall of Frost

Defender
Whenever Wall of Frost blocks a creature, that creature doesn't untap during its controller's next untap step.

Floodgate

Defender
When Floodgate has flying, sacrifice it.
When Floodgate leaves the battlefield, it deals damage to each nonblue creature without flying equal to half the number of Islands you control, rounded down.

Wall of Dust

Defender (This creature can't attack.)
Whenever Wall of Dust blocks a creature, that creature can't attack during its controller's next turn.

Mountain

Cinder Wall

Defender
When Cinder Wall blocks, destroy it at end of combat.

Razorgrass Screen

Defender (This creature can't attack.)
Razorgrass Screen blocks each combat if able.

Perimeter Captain

Defender
Whenever a creature you control with defender blocks, you may gain 2 life.

Always Watching

Nontoken creatures you control get +1/+1 and have vigilance.

Fog Bank

Defender (This creature can't attack.)
Flying
Prevent all combat damage that would be dealt to and dealt by this creature.

Honor of the Pure

Dictate of Heliod

Wall of Denial

Defender, flying
Shroud (This creature can't be the target of spells or abilities.)

Propaganda

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

Amaranthine Wall

Defender
{2}: Amaranthine Wall gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Arcane Signet

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

Glorious Anthem

Pramikon, Sky Rampart

Flying, defender
As Pramikon, Sky Rampart enters, choose left or right.
Each player may attack only the nearest opponent in the chosen direction and planeswalkers controlled by that opponent.

Wall of Junk

Defender (This creature can't attack.)
When Wall of Junk blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)

Island

Builder's Blessing

Untapped creatures you control get +0/+2.

Coastal Bulwark

Defender
Coastal Bulwark gets +2/+0 as long as you control an Island.
{2}, {T}: Surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)

Clockwork Drawbridge

Defender
{2}{W}, {T}: Tap target creature.

Wall of Reverence

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

Tuktuk Rubblefort

Defender, reach
Creatures you control have haste.

Blessed Sanctuary

Prevent all noncombat damage that would be dealt to you and creatures you control.
Whenever a nontoken creature you control enters, create a 2/2 white Unicorn creature token.

Wall of Essence

Defender (This creature can't attack.)
Whenever Wall of Essence is dealt combat damage, you gain that much life.

Plains

Rally the Ranks

As Rally the Ranks enters, choose a creature type.
Creatures you control of the chosen type get +1/+1.

Ghostly Prison

Adaptive Automaton

As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
Other creatures you control of the chosen type get +1/+1.

Sunweb

Defender (This creature can't attack.)
Flying
Sunweb can't block creatures with power 2 or less.

Ferocity of the Wilds

Attacking non-Human creatures you control get +1/+0 and have trample.

Battle Rampart

Defender
{T}: Target creature gains haste until end of turn.

Steel Wall

Wall of Hope

Defender (This creature can't attack.)
Whenever Wall of Hope is dealt damage, you gain that much life.

Angelic Wall

Defender (This creature can't attack.)
Flying

Rolling Stones

Wall creatures can attack as though they didn't have defender.

Castle

Junkyo Bell

At the beginning of your upkeep, you may have target creature you control get +X/+X until end of turn, where X is the number of creatures you control. If you do, sacrifice that creature at the beginning of the next end step.

Sol Ring

Wall of Omens

Defender
When Wall of Omens enters, draw a card.

Goblin War Drums

Creatures you control have menace. (They can't be blocked except by two or more creatures.)

Fortifying Provisions

Creatures you control get +0/+1.
When Fortifying Provisions enters, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")

Snow Fortress

Defender (This creature can't attack.)
{1}: Snow Fortress gets +1/+0 until end of turn.
{1}: Snow Fortress gets +0/+1 until end of turn.
{3}: Snow Fortress deals 1 damage to target creature without flying that's attacking you.

Glacial Wall

Academy Wall

Defender
Whenever you cast an instant or sorcery spell, you may draw a card. If you do, discard a card. This ability triggers only once each turn.

Aether Membrane

Defender; reach (This creature can block creatures with flying.)
Whenever Aether Membrane blocks a creature, return that creature to its owner's hand at end of combat.

Dark Maze

Defender (This creature can't attack.)
{0}: Dark Maze can attack this turn as though it didn't have defender. Exile it at the beginning of the next end step.

Coral Colony

Defender
{1}{U}, {T}: Target player mills X cards, where X is the number of creatures you control with defender. (To mill a card, a player puts the top card of their library into their graveyard.)