Mothlight Processionist is a rare Creature — Human Cleric card from Alchemy: Duskmourn (YDSK), collector number 3.
Enchantment spells you cast have convoke. Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, conjure a card named Mothlight Processionist into your hand. Discard that card at the beginning of the next end step.