Whenever a land's ability causes you to add one or more mana of the chosen color, add an additional one mana of that color
A land that replaces itself with a card can be effective in the late game to mitigate flood and find that last card you need, but taking damage every time you tap for mana adds up quickly
Tier one would be European languages like French, Italian, or Spanish, which hold a value very close to the English version with German cards being just a touch higher
Things get even better when you combine Cathar's Crusade with spells that cause multiple creatures to enter at the same time , like Entreat the Angels of Hop To It
3: Destroy all creatures with power 4 or greater
Whether in the mainboard or the sideboard, there always seems to be a place for a full playset of Preachers when you're playing black