Ring of Xathrid [Magic 2013] Guilds of Ravnica (Each {B} in the mana

(Each {B} in the mana costs of permanents you control counts toward your devotion to black

but what remains is his final gift to his people: the right to be left alone

The storm wasn't an omen

Set: Legends Type: Instant Rarity: Uncommon Cost: {U} One or more target creatures become blue until end of turn

Ring of Xathrid [Magic 2013] Guilds of Ravnica (Each {B} in the manaSet: Magic 2013 Type: Artifact Equipment Rarity: Uncommon Cost: {2} {2}: Regenerate equipped creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.) At the beginning of your upkeep, put a +1 +1 counter on equipped creature if it's black. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)