Obsidian Acolyte

Protection from black
{W}: Target creature gains protection from black until end of turn.

Wall of Hope

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

Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.
{B}: Pestilence deals 1 damage to each creature and each player.

Dromad Purebred

Whenever Dromad Purebred is dealt damage, you gain 1 life.