Search your library for a creature card with mana value X or less, where X is 2 plus the sacrificed creature's mana value
Keeping Kefka alive a whole turn cycle to use his ability again might be tough, but at least in black there's a fair few protection spells
While you could definitely just play this in a normal BR goblins deck, its much more potent with cards like The Cauldron of Eternity, Workhorse, and the like
If so then Reveillark is great but if not then it is fairly unexciting
Regrowing Seeds of the Past The biggest takeaway from Phasings return lies there: recognizing the value hidden within discarded, weaker, and less popular designs
Effects range from really good (gain wishes, experience, items, etc.) to extremely bad (fight a mini-death, lose all your possessions, or be locked in a void almost impossible to find)