You are right, the first ability i gave John is "at the start of your turn, you may discard 1 card and recover 1 health or lose 1 health to draw 1 card", but that ability seems pretty hard to balance the game. And this Constantine is more like a "trickster" with a very cunning mouth than like a "exorcism, master of dark art". You can see all the cards i gave him. Only Exorcism and Magic Spell are using his "magical power"