D'Avenant Archer

{T}: D'Avenant Archer deals 1 damage to target attacking or blocking creature.

Eiganjo, Seat of the Empire

{T}: Add {W}.
Channel — {2}{W}, Discard Eiganjo, Seat of the Empire: It deals 4 damage to target attacking or blocking creature. This ability costs {1} less to activate for each legendary creature you control.

Sinstriker's Will

Enchant creature
Enchanted creature has "{T}: This creature deals damage equal to its power to target attacking or blocking creature."

Desert

{T}: Add {C}.
{T}: Desert deals 1 damage to target attacking creature. Activate only during the end of combat step.

Mountain

Command Tower

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

Quilled Sliver

All Slivers have "{T}: This permanent deals 1 damage to target attacking or blocking creature."

Crossbow Infantry

{T}: Crossbow Infantry deals 1 damage to target attacking or blocking creature.

Shield Dancer

{2}{W}: The next time target attacking creature would deal combat damage to Shield Dancer this turn, that creature deals that damage to itself instead.

D'Avenant Healer

{T}: D'Avenant Healer deals 1 damage to target attacking or blocking creature.
{T}: Prevent the next 1 damage that would be dealt to any target this turn.

Kongming's Contraptions

{T}: Kongming's Contraptions deals 2 damage to target attacking creature. Activate only during the declare attackers step and only if you've been attacked this step.

Ben-Ben, Akki Hermit

{T}: Ben-Ben, Akki Hermit deals damage to target attacking creature equal to the number of untapped Mountains you control.

Gravel Slinger

{T}: Gravel Slinger deals 1 damage to target attacking or blocking creature.
Morph {1}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Unerring Sling

{3}, {T}, Tap an untapped creature you control: Unerring Sling deals damage equal to the tapped creature's power to target attacking or blocking creature with flying.

Basandra, Battle Seraph

Flying
Players can't cast spells during combat.
{R}: Target creature attacks this turn if able.

Plains

Catapult Squad

Tap two untapped Soldiers you control: Catapult Squad deals 2 damage to target attacking or blocking creature.

Avenger en-Dal

{2}{W}, {T}, Discard a card: Exile target attacking creature. Its controller gains life equal to its toughness.