Order of High Skirsdag

Other cleric and Demon creatures get +1/+1.
Demon spells you cast have invoke. (Each creature
you sacrifice while casting them pays for {1} or one
mana of that creature's color.)
Whenever a Demon enters the battlefield, for
each cleric that invoked it, reveal the top card of
your library and put it into your hand. Each
opponent loses life equal to its converted mana
cost.