The story events of that plane involved the five shards of Alara (Esper, Bant, Jund, Grixis, and Naya) recombining into a single plane at the machinations of Nicol Bolas
We'll not go quite in-depth in Blue, but that's because Blue has a more even distribution of cards between the titular 'empire', the Vodalian Merfolk, and the monsters that took down their empire
Currently, TCGPlayer is still gathering data on the market value of Pokmon TCG: Pitch Black 's card 114/084, with only four recorded sales at the time of writing
Teysa Karlov, Elas il-Kor, Sadistic Pilgrim, Athreos, God of Passage and others are quite likely to use this enchantment both for life gain and to buff their aristocrats: Blood Artist, Zulaport Cutthroat among others
Sokkas Haiku This is an absolute gem in the flavor department, but as a card, Sokkas Haiku is certainly relegated to Limited, with perhaps one exception
On the bright side, if they dont have removal or sweepers, you probably win