Pilgrim of Virtue

Protection from black
{W}, Sacrifice Pilgrim of Virtue: The next time a black source of your choice would deal damage this turn, prevent that damage.

Light of Day

Brave the Elements

Choose a color. White creatures you control gain protection from the chosen color until end of turn.

Devout Lightcaster

Protection from black
When Devout Lightcaster enters, exile target black permanent.

Sanctifier en-Vec

Protection from black and from red
When Sanctifier en-Vec enters, exile all cards that are black or red from all graveyards.
If a black or red permanent, spell, or card not on the battlefield would be put into a graveyard, exile it instead.

Pentarch Paladin

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
As Pentarch Paladin enters, choose a color.
{W}{W}, {T}: Destroy target permanent of the chosen color.

Mirran Crusader

Double strike, protection from black and from green

Mana Tithe

Counter target spell unless its controller pays {1}.

Knight of Glory

Protection from black (This creature can't be blocked, targeted, dealt damage, or enchanted by anything black.)
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Circle of Protection: Black

{1}: The next time a black source of your choice would deal damage to you this turn, prevent that damage.

Crusading Knight

Protection from black
Crusading Knight gets +1/+1 for each Swamp your opponents control.

Celestial Purge

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Karma

At the beginning of each player's upkeep, Karma deals damage to that player equal to the number of Swamps they control.

Lightwielder Paladin

First strike (This creature deals combat damage before creatures without first strike.)
Whenever Lightwielder Paladin deals combat damage to a player, you may exile target black or red permanent that player controls.