Harrow [Magic Player Rewards 2010] Archenemy Set: Invasion Type: Instant Rarity:

Set: Invasion Type: Instant Rarity: Rare Cost: {2}{U} Change the text of target spell or permanent by replacing all instances of one color word with another or one basic land type with another until end of turn

If the player discards a card this way

Flashback—Tap an untapped white creature you control

Set: Rise of the Eldrazi Type: Enchantment — Aura Rarity: Rare Cost: {2}{G}{G} Enchant creature

They are also known for their hymns to the dead

Harrow [Magic Player Rewards 2010] Archenemy Set: Invasion Type: Instant Rarity:Set: Magic Player Rewards 2010 Type: Instant Rarity: Rare Cost: {2}{G} As an additional cost to cast this spell, sacrifice a land. Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.