High Alert

Each creature you control assigns combat damage equal to its toughness rather than its power.
Creatures you control can attack as though they didn't have defender.
{2}{W}{U}: Untap target creature.

Negate

Azorius Signet

Crashing Drawbridge

Defender
{T}: Creatures you control gain haste until end of turn.

Axebane Guardian

Defender
{T}: Add X mana in any combination of colors, where X is the number of creatures you control with defender.

Arcane Denial

Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.

Assault Formation

Each creature you control assigns combat damage equal to its toughness rather than its power.
{G}: Target creature with defender can attack this turn as though it didn't have defender.
{2}{G}: Creatures you control get +0/+1 until end of turn.

Aegis of the Heavens

Target creature gets +1/+7 until end of turn.

Farseek

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

Tetsuko Umezawa, Fugitive

Creatures you control with power or toughness 1 or less can't be blocked.

Riptide Turtle

Steel Wall

Perimeter Captain

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

Sunscape Familiar

Defender (This creature can't attack.)
Green spells and blue spells you cast cost {1} less to cast.

Flumph

Defender, flying
Whenever Flumph is dealt damage, you and target opponent each draw a card.

Arcane Signet

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

Wall of Denial

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

Tower Defense

Creatures you control get +0/+5 and gain reach until end of turn.

Vine Trellis

Defender (This creature can't attack.)
{T}: Add {G}.

Wall of Tanglecord

Defender
{G}: Wall of Tanglecord gains reach until end of turn. (It can block creatures with flying.)

Meekstone

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Selesnya Signet

Wall of Mulch

Defender (This creature can't attack.)
{G}, Sacrifice a Wall: Draw a card.

Mirari's Wake

Creatures you control get +1/+1.
Whenever you tap a land for mana, add one mana of any type that land produced.

Wall of Omens

Defender
When Wall of Omens enters, draw a card.

Swiftfoot Boots

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control.)
Equip {1}

Primal Rage

Creatures you control have trample. (A creature with trample can deal excess combat damage to the player or planeswalker it's attacking.)

Sol Ring

Kodama's Reach

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Wall of Runes

Defender (This creature can't attack.)
When Wall of Runes enters, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Skyshroud Claim

Search your library for up to two Forest cards, put them onto the battlefield, then shuffle.

Fortified Rampart

Tree of Redemption

Defender
{T}: Exchange your life total with Tree of Redemption's toughness.

Wall of Blossoms

Defender
When Wall of Blossoms enters, draw a card.

Wall of Glare

Defender (This creature can't attack.)
Wall of Glare can block any number of creatures.

Wild Pair

Whenever a creature enters, if you cast it from your hand, you may search your library for a creature card with the same total power and toughness, put it onto the battlefield, then shuffle.

Slaughter the Strong

Each player chooses any number of creatures they control with total power 4 or less, then sacrifices all other creatures they control.

Huatli, the Sun's Heart

Each creature you control assigns combat damage equal to its toughness rather than its power.
−3: You gain life equal to the greatest toughness among creatures you control.

Cultivate

Stalwart Shield-Bearers

Defender
Other creatures you control with defender get +0/+2.

Panharmonicon

If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Overgrown Battlement

Defender
{T}: Add {G} for each creature you control with defender.

Dovin's Veto

This spell can't be countered.
Counter target noncreature spell.

Teferi's Ageless Insight

If you would draw a card except the first one you draw in each of your draw steps, draw two cards instead.

Arcades, the Strategist

Flying, vigilance
Whenever a creature you control with defender enters, draw a card.
Each creature you control with defender assigns combat damage equal to its toughness rather than its power and can attack as though it didn't have defender.

Wall of Essence

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

Simic Signet

Mentor of the Meek

Whenever another creature you control with power 2 or less enters, you may pay {1}. If you do, draw a card.

Wall of Hope

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

Fell the Mighty

Destroy all creatures with power greater than target creature's power.

Fellwar Stone

{T}: Add one mana of any color that a land an opponent controls could produce.

Wave of Reckoning

Each creature deals damage to itself equal to its power.

Stoneskin

Flash
Enchant creature
Enchanted creature gets +0/+10.

Aura Shards

Whenever a creature you control enters, you may destroy target artifact or enchantment.