Contamination [The List] Uncommon flesh-and-blood priests of the Convergence

flesh-and-blood priests of the Convergence take to battle alongside the clockwork soldiers of their goddess at tremendous personal risk

Afrika Korps Starter Army contains:

Set: Doctor Who Type: Artifact — Equipment Rarity: Uncommon Cost: {2} Equipped creature has haste and shroud

Activated abilities of lands you control cost 1 less to activate

but if they do

Contamination [The List] Uncommon flesh-and-blood priests of the ConvergenceSet: The List Type: Enchantment Rarity: Rare Cost: {2}{B} At the beginning of your upkeep, sacrifice Contamination unless you sacrifice a creature. If a land is tapped for mana, it produces {B} instead of any other type and amount.